Aaahh! Real Monsters action figures never show up on my flea market hunts. Ok, not 'never', they only show up ONCE EVER! And this is it: The Gromble.
This guy reminds me of something from The Beatles' Yellow Submarine (and makes me regret giving up my Blue Meanie action figure years ago.) He also looks like he was set too close to a candle as his left ear/fin is a bit singed. He's missing some sort of launchable character that flew from his mouth too, but whatever, he's a goofy looking monster and it's almost Halloween, so yeah.