A Frog with Pockets
A dumb kid who keeps random stuff in their pockets, like a frog, because they're too brain-dead to know what's useful.
My cousin is a frog with pockets. He keeps marbles, string, and a dead frog in his pocket.
That kid is a frog with pockets. He has a bottle cap and a crumpled napkin in his pocket.
He's so dumb he brought a frog to school. He's a frog with pockets.