Both of those would do. "Slop Kiddie" highlights the pile of crap / nuisance produced. "Vibe Kiddie" highlights how it came about, and could be used in cases where actually a brilliant result came out. "Hey, this vibe kiddie just proved some long-standing math conjecture!".

Slop Jockeys? or would that be better for people passing off AI content as their own?

"Slop Kiddies" is good. That lets us use the "skiddies" contraction for both the "script" and "slop" kind of kiddie.