Question: Craig Frost is known as the keyboardist fo an American rock band whose names is a play on words of what?

Context paragraphs:
7th Order: 7th Order is an American Rock & Roll band whose debut extended play CD release, "The Lake of Memory", was issued on the Big Island Sounds label in 2007 (although 7th Order had been in existence for several years by that time).

The Lost Patrol: The Lost Patrol is an American rock band whose music falls into the categories of experimental, gothic, post-punk, dark wave, ethereal wave, folk, alternative country, shoegazing, spaghetti western and "surf-a-billy".  The band uses electric guitars, 12-string acoustic guitars, Moog and other synthesizers.

Meneguar: Meneguar was an indie rock band whose members had previously played under different arrangements and names, but which reached its current form in 2004 in Brooklyn, New York.  The group released its second CD, "Strangers in Our House", on the Troubleman Unlimited label. " Rolling Stone" magazine reviewed the album, saying, "The genius and beauty of Strangers in Our House, and Meneguar as a whole, is that every song they release could be considered the album's single.  The songs are so energetic and youthful that it's impossible to not get wrapped up by them, caught up and singing along to all the choruses and dancing to every melody."

Grand Funk Railroad: Grand Funk Railroad, sometimes shortened as Grand Funk, is an American rock band popular during the 1970s, when they toured extensively and played to packed arenas worldwide.  David Fricke of "Rolling Stone" magazine once said, "You cannot talk about rock in the 1970s without talking about Grand Funk Railroad!"  Known for their crowd-pleasing arena rock style, the band was well-regarded by audiences despite a relative lack of critical acclaim.  The band's name is a play on words of the Grand Trunk Western Railroad, a line that ran through the band's home town of Flint, Michigan.

Craig Frost: Craig Frost (born April 20, 1948 in Flint, Michigan) is the keyboardist for Bob Seger & The Silver Bullet Band.  He is also known as keyboardist for 1970s hard rock band Grand Funk Railroad.  He plays organ, synthesizer, and piano.

Eisblume: Eisblume (German for "Frost Flower") is a German Pop rock band whose debut album spawned the Top 5 hit single "Eisblumen" in Germany in 2009.

The United States of America (band): The United States of America was an American experimental rock band whose works, recorded in late 1967, are an early example of the use of electronic devices in rock music.  The short-lived band was founded in Los Angeles by experimental composer Joseph Byrd and singer and lyricist Dorothy Moskowitz, with musicians Gordon Marron, Rand Forbes and Craig Woodson, but split up shortly after the release of their only album in 1968.  Their sound blended a range of musical genres, including avant-garde, psychedelic, and art rock, with many of the songs' lyrics reflecting Byrd's leftist political views.  Unusually, the band had no guitar player; instead, they used strings, keyboards and electronics, including primitive synthesizers, and various audio processors, including the ring modulator.  According to critic Kevin Holm-Hudson, "what distinguishes the United States of America from some of its contemporaries... is the seriousness and skill with which they incorporated avant-garde and other influences into their music."

Pure Prairie League: Pure Prairie League is an American country rock band whose roots go back to 1965 and Waverly, Ohio, with Craig Fuller, Tom McGrail, Jim Caughlan, and John David Call.  In 1970 McGrail named the band after a fictional 19th century temperance union featured in the 1939 Errol Flynn cowboy film "Dodge City".  The band had five consecutive Top 40 LPs in the 1970s and added a sixth in the 1980s.  The band has had a long run, active from the 1970s through the late 1980s and was revived in the late 1990s for a time, then again in 2004.  As of 2017, they are still doing at least 100 shows a year.

Flamin' Groovies: Flamin' Groovies is an American rock music band whose peak was in the 1960s and 1970s.  They began in San Francisco in 1965, founded by Cyril Jordan and Roy Loney.  The group have been called one of the forerunners of punk rock, and they also had a major influence on the power pop genre.

New Colony Six: New Colony Six (sometimes abbreviated as NC6) is an American soft rock band whose height of popularity was from the mid-1960s to the early 1970s.  From Chicago, the group placed ten singles on the Hot 100 between 1966 and 1971.  Original members were Ray Graffia (vocals), who was born March 28, 1946, Chick James (drums), Pat McBride (harmonica), Craig Kemp (organ), Wally Kemp (bass), and Gerry Van Kollenburg (guitar), who was born June 26, 1946.  Ronnie Rice (vocals, keyboards, guitar) replaced Craig Kemp as soon as Mr. Rice joined this group in 1966.  There were numerous changes in the lineup over the years.  The band's two biggest hits, which peaked on WLS months before they peaked nationally, were Rice's "I Will Always Think About You" (WLS #1 on 25 March 1968) (Hot 100 #22 on 1 June 1968) (#14 RPM Canada) and "Things I'd Like to Say" (WLS #2 on 30 December 1968) (Hot 100 #16 on 22–29 March 1969) (#6 Canada).  In Canada they also hit the charts with an earlier song "Love You So Much" (WLS #2 on 27 January 1967) (Hot 100 #61 on 25 March 1967) (#49 Canada) and the later "I Could Never Lie To You" (WLS #7 on 26 May - 2 June 1969) (Hot 100 #50 on 14 June 1969) (#38 Canada).

Supporting paragraphs: Craig Frost Grand Funk Railroad
Answer: Grand Trunk Western Railroad