Awww, you didn't like Gex?
Anyway, YES! Dan Castelanetta (or however you spell his last name!) did infact voice Earthworm Jim. He did the cartoon series, ClayFighter 63 1/3 and Earthworm Jim 3D. If you listen closely, it's sometimes easy to hear Homer and various other characters from the Simpsons in his voice, especially when Jim is screaming in pain (or laughing like a maniac).
I didnt hate him, but I think hes definitely my least favorite of the 90s video game mascots : p
And haha yeah, I just typed "guy who played Homer" cuz I didnt wanna try to spell his last name : p Thats way cool though, is a good choice, hes an awesome VA.