Frischman's first co-starring role was that of Manhattan-based high school student Arvid Engen on ABC-TV's late 1980s/early 1990s series Head of the Class.
He was first noticed in a March 17, 1982, episode of the NBC television series The Facts of Life. In the episode, titled "Kids Can Be Cruel" Frischman played high school student "Carl 'Rocky' Price" who was picked on by his peers because of his acne and nerd-like personality. The students in the episode referred to Frischman's character as "Pizzaface", because of his pronounced acne blemishes and scars. In the episode the character Natalie Green, played by Actress Mindy Cohn, gets angry at her roommate Blair Warner (Lisa Whelchel) and sets her up with Frischman's character "Rocky" as a cruel joke.
In 1983, Frischman appeared in the comedy cult film Get Crazy as Joey, a typically nerdy (and virginal) stagehand who ultimately gets the girl. Also in 1983, he starred in the "Things your Parents Used to Say" sequence in Good-bye, Cruel World.
On Saturday December 20, 1986, Frischman and the cast of Head of the Class were the Celebrity guests on the long running urban music series Soul Train. Musical guests that week were Al Jarreau and Vesta Williams.
On Wednesday July 15, 1987 Frischman appeared as that evening's guest on NBC-TV's highly rated evening talk show Late Night with David Letterman.
Frischman's second co-starring role was the character of Chris Potter in the 1990s Nickelodeon TV series Kenan & Kel, a spin-off of Nickelodeon's All That starring Kenan Thompson and Kel Mitchell. (Frischman's fellow HOTC alumni, Dan Schneider and Brian Robbins were producers of Kenan & Kel.) Once again Frischman played a socially awkward nerd, this time as Chris Potter, Kenan's boss at Rigby's, a small grocery store.
Frischman made a short appearance on the 1990s series Seinfeld. In episode 93, titled "The Mom & Pop Store" (which originally aired on Thursday November 17, 1994 on U.S. television network NBC), Frischman plays a man who phones Jerry Seinfeld to tell the Comedian that he has found his stolen sneaker collection at a yard sale in Parsippany, New Jersey (one town north of the town Frischman grew up in).
On October 24, 2005, Frischman was a Celebrity panelist on I Love the '80s 3-D, a television program on VH1.
