New hostile mob for dappled forest

It would resemble a acorn with little arms and legs kicking out the sides with a mean face in the center and be shorter with similar statue of a copper golem, it will drop out of the trees at night time and latch onto your back like baby zombies do when they ride a regular zombie and it would cause your controls to be inverted. The way to get them off is to hop in water, shake your head up and down for a while, or have a buddy whack em off.