Mattel

Mattel is an toy manufacturing company founded in 1945 with headquarters in El Segundo, California. The products and brands it produces include Fisher-Price, Barbie, Monster High, Ever After High, Polly Pocket, Enchantimals, Hot Wheels, Matchbox, Masters of the Universe, American Girl, and Thomas & Friends. In the early 1980s, Mattel produced video game systems, under its own brands and under license from Nintendo. 
The name Mattel is a blend of the names of Harold "Matt" Matson and Elliot Handler, two of the company's founders.
In 1997, Mattel has been making tons of hey arnold plushies based on its main cast. The plush line ended in 2003 but sets were being sold at stores such as Toys R Us until 2004.
All plush sets:
The Main Boyz: Set includes Arnold, Gerald, Harold, Sid, Stinky, Eugene and Brainy. (Released in 1997)
The Main Girlz: Set Includes Helga, Pheobe, Rhonda, Nadine, Ruth and Sheena. (Released in 1997)
Sunset Arms Residents: Set Includes Mr. Hyunh, Mai Hyunh, Ernie, Oskar, Suzie, Lana Vail, Mr. Smith and Mr. Purdy. (Released in 1998-1999)
Arnold's Family: Phil, Gertie, Mitzi, Stella and Miles. (Released in 1999 or 2000)
Helga's Family: Big Bob, Mariam and Olga. (Released in 1999 or 2000)
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