Question: What county shares a border with the other county that once held the settlement of Frosts?

full_context: Document 1: Forbes, California: Forbes is a former settlement in Marin County, California. It was located on the Northwestern Pacific Railroad south-southeast of downtown Novato, at an elevation of 33 feet (10 m). Forbes still appeared on maps as of 1914.
Document 2: Enterprise, Butte County, California: Enterprise (formerly, Mountain Spring) is a former settlement in Butte County, California. It was located west-northwest of Forbestown on the South Fork of the Feather River, at an elevation of 902 feet (275 m). In 1968, it was inundated by Lake Oroville.
Document 3: Frosts, California: Frosts is a former settlement in El Dorado County, California. It was located south-southeast of Meeks, at an elevation of 6237 feet (1901 m). It still appeared on maps as of 1895.
Document 4: Warner Cope: Born in Kentucky, Cope came to California in 1850 and tried mining, but found little success. In 1853 he resumed work as an attorney, first in El Dorado County and the next year in Jackson, Amador County. In October 1858, he was elected to the California State Assembly from Amador as a Democrat.
Document 5: Robert C. Kirkwood: Robert C. Kirkwood (August 30, 1909 – May 5, 1964) served as a member of the California State Assembly representing part of Santa Clara County from 1947 until 1953, when he resigned to accept an appointment as California State Controller by Governor Earl Warren. Kirkwood was elected to a full term in 1954, but lost a re-election bid in 1958 to Alan Cranston, who later became a United States Senator.
Document 6: Salmon Falls, California: Salmon Falls is a former settlement in El Dorado County, California. It was located on the South Fork of the American River south-southwest of Pilot Hill, at an elevation of 469 feet (143 m). It was flooded by Folsom Lake. Nearby were waterfalls from which the place got its name. The site is now registered as California Historical Landmark #571.
Document 7: David C. Westenhaver: Born in Berkeley County, West Virginia, Westenhaver received a Bachelor of Laws from Georgetown Law in 1886. He was in private practice in Martinsburg, West Virginia from 1886 to 1903, serving as a prosecuting attorney of Berkeley County from 1886 to 1887, and as a member of the Martinsburg City Council from 1902 to 1903. He then moved his practice to Cleveland, Ohio from 1903 to 1917, and was a member of the Board of Education of Cleveland from 1912 to 1915.
Document 8: Chris Cannon: He was born in Salt Lake City, Utah and attended Brigham Young University (BYU) as well as J. Reuben Clark Law School of BYU. From 1980 until 1996 he was a lawyer, business owner, and venture capitalist, from which he became a millionaire. Other jobs include time as a solicitor for the United States Department of the Interior from 1983 to 1986, and time as Utah Republican Party finance chairman from 1992 until 1994. On June 24, 2008, he was defeated in the 2008 Republican Party third district primary by Jason Chaffetz, former chief of staff to then-Utah Governor Jon Huntsman, Jr.
Document 9: South Fork, Butte County, California: South Fork is a former settlement in Butte County, California, USA. It lay at an elevation of 1375 feet (419 m). It still appeared on maps as of 1947, and was inundated by Lake Oroville. South Fork was located east-southeast of Bidwell's Bar on the Feather River.
Document 10: Southern California: Subsequently, Californios (dissatisfied with inequitable taxes and land laws) and pro-slavery southerners in the lightly populated "Cow Counties" of southern California attempted three times in the 1850s to achieve a separate statehood or territorial status separate from Northern California. The last attempt, the Pico Act of 1859, was passed by the California State Legislature and signed by the State governor John B. Weller. It was approved overwhelmingly by nearly 75% of voters in the proposed Territory of Colorado. This territory was to include all the counties up to the then much larger Tulare County (that included what is now Kings, most of Kern, and part of Inyo counties) and San Luis Obispo County. The proposal was sent to Washington, D.C. with a strong advocate in Senator Milton Latham. However, the secession crisis following the election of Abraham Lincoln in 1860 led to the proposal never coming to a vote.
Document 11: David, California: David is a former settlement in Butte County, California. It was located north-northwest of Berry Creek on the Western Pacific Railroad, at an elevation of 1014 feet (309 m). David still appeared on maps as of 1948.
Document 12: Bernard Coy: Coy was a native of Kentucky who turned to crime during the Great Depression and, in 1937, was sentenced to 25 years imprisonment. He was transferred to Alcatraz from Atlanta in 1938 and was later given the position of cell-house orderly which allowed him access through most of the main cell-block on Alcatraz. This relative freedom allowed him to spot a tiny flaw in one of the prison's security features, the bars of the gun-gallery overlooking the cell house. Coy along with Joe Cretzer, Marvin Hubbard, Sam Shockley, Miran Thompson, and Clarence Carnes planned to break into the gun galleries to steal weapons, take hostages and then flee to the dock. He was successful in creating a makeshift bar-spreader that enabled him to get through the relatively weak bars that protected the gun galleries and overpower the unsuspecting guard on his return from investigating a fabricated incident caused by Shockley in the prison's secure unit, D-Block.
Document 13: Pete Goicoechea: Goicoechea was born in Salt Lake City and studied at Utah State University. He has owned a ranch since 1970 and also worked for many years for the Eureka County, Nevada road department. He served on the Eureka County Commission from 1987 to 2002 and then was elected to the Nevada State Assembly. He has also served as a member of the Nevada State Land Use Planning Advisory Council, the Nevada Grazing Board, and he has been the Director of the Nevada Water Resource Association. He is affiliated with the Eureka Volunteer Fire Department, E Clampus Vitus, the Humboldt River Authority, and the Nevada Rural Health Center. Goicoechea is a Catholic. He and his wife Glady are the parents of two children.
Document 14: Charles P. Snyder: After studying law, he was admitted to the bar and opened a practice. He became prosecuting attorney of Kanawha County and served from 1876 to 1884. He was elected in 1882 to the Forty-eighth Congress to fill the vacancy caused by the resignation of John E. Kenna He won re-election to the Forty-ninth and Fiftieth Congresses and served from May 15, 1883 to March 3, 1889. He served as a judge on the criminal court of Kanawha County from 1890 to 1896. He was named United States consul to Ciudad Porfirio Diaz, Mexico from 1897 to 1901. He died in Vineland, New Jersey in Cumberland County on August 21, 1915 and was buried in Spring Hill Cemetery in Charleston, West Virginia.
Document 15: Forest Home, Amador County, California: Forest Home is a former settlement in Amador County, California. It was located west of Plymouth, at an elevation of 581 feet (177 m). It still appeared on USGS maps as of 1944.
ground_truth: Amador County
sub_queries: Frosts >> located in the administrative territorial entity Answer: El Dorado County
El Dorado County >> shares border with Answer: Amador County