The rocket power pilot episode "Rocket beach" is another piece of lost nicktoon media. It's easy to tell it's the pilot since all the characters are completely different from the tv series.
I know the other 4. One was called "Nacho Bear" the second one was called "Big baby" I think.... The third one was called "The Bremen Avenue Experience" and the last one was called "The talented Mr.Bixby."
Nickelodeon fruit snacks from 2002 were the stuff. There was also a Nickelodeon candy from 2004ish featuring SpongeBob, and FOP's Cosmo & Wanda called "Slime dunk" or something like that.
There was an old animated commercial Danny Antonucci did for kids footlocker before EENE was made... There were 4 kids in the commercial who were kinda like a prototype version of the Eds and Kevin. Heck, it even had the same squigglevision animation as EENE in this old commercial