Not to be confused with Pumpkinman.

Pumpkinheads are orange biped-modeled mobs with a pumpkin head (this is the texture, not the block turned into a hat). When you hit one, the rest attacks, but the one you hit stares at you until the crosshair is out of him (attacking it will move the crosshair to him temporarily) then it will start attacking. Pumpkin-headed ones are neutral, while Jack-o-Lantern-headed ones are directly hostile.