Small Hammer Bro
From the Super Mario Wiki
Small Hammer Bros. (which are actually regular-sized Hammer Bros. enchanted by Kamek) appear in Paper Mario: Color Splash in the Sacred Forest. Only two make an appearance in the game. They both ambush Mario after he repairs the blue Mini Paint Star. Small Hammer Bros. attack by throwing their hammers, just like normal Hammer Bros., though sometimes the attack will not reach Mario.