Not quite... Kronis is who Trap Jaw
originally was (if that makes sense)...well, at least in the 200X cartoon!
He was originally a blue skinned dude (named Kronis) who was injured during the first 3 part episode, causing him to get "repaired" by Tri-Klops into (what we now know him as) Trap Jaw. Kinda like Eternia's answer to RoboCop!
It's a neat little side-story, but it's only ever been in the 200X cartoon. It was never part of the old cartoon or the comics.