From the Super Mario Wiki
A Zombie Shroom is an enemy that appeared in Super Paper Mario. Sometimes Mario, Princess Peach, Bowser or Luigi will find a Mushroom or a relative item in a ? Block that instead immediately turns into a Zombie Shroom, targeting the hero and dealing two damage with each hit. They have low HP – one jump defeats it. There's a stronger variant of this enemy, the Ghoul Shroom.
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