These are PB's minions, or also know as the Banjiz (Ban-Cheez).

But are you sure

Ok

These things can multiply, change size, shapeshift, and turn invisible. they can spit acid and travel under ground, and they have incredible strength . All they know is to destroy and kill, be aware cuz they can wonder on they're own. But they are dumb, so to make it a bit easy.