From the Super Mario Wiki
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Pitchforks usually hang on ceilings and if Wario is under them, they wrench themselves out of the ceiling and fall to the ground. If they see Wario when on the ground, they will run towards him trying to stab him with their fork. However, if Wario dodges them and they hit a wall, they will be stuck. Wario can then pick them up and throw them. Wario can also jump off of them to get extra height.
Pitchforks come in two different varieties, the more common blue ones, and purple ones, which can jump.