Jumping Pumpkin Plant
From the Super Mario Wiki
Jumping Pumpkin Plants are enemies that replace Jumping Piranha Plants after the player beats Special World in Super Mario World. Their buds are encased in a Jack-o-Lantern. They act the same way as Jumping Piranha Plants: they wait for Mario (or Luigi) to approach. If he approaches, the plant flies out of the pipe, trying to hurt Mario.