Apart from his games console, Clyde Frog was by far Eric's favourite toy. He was seen playing with it regularly, including times when he held a tea party and pretended that the toy insulted him, or when he used it as a deputy sheriff helping to rescue "Salma Hayek" in his version of Wild Wild West.
Clyde Frog met a grisly end when Kyle ripped off his head to get his revenge for Cartman giving him HIV in the episode "Tonsil Trouble".
Clyde Frog: Yes, please, Eric. Why are you so cool?
Cartman: Oh. I don't know, Clyde Frog. I just am.
Clyde Frog: I think you're a big fat piece of crap.