From WiKirby, your independent source of Kirby knowledge.
Mr. P. Umpkin is an enemy from Kirby's Dream Land who only appears in the Castle Lololo stage. It is found only in Extra Game - replacing Two Face - and behaves in much the same way.
Mr. P. Umpkin takes its name from its jack o' lantern like appearance. It remains dormant on the wall until Kirby passes by, then springs to life with a different face. From then on, it chases Kirby, spiraling around him until it is defeated or hits him. It moves generally faster than its Normal game counterpart.
Mr. P. Umpkins retain their design in the Pilot episode for Kirby: Right Back at Ya!, and appear in that episode alongside the Sweet Stuff, the Haboki, etc.
Kirby's Dream Land sprite