Garbage Can Ghost
From the Super Mario Wiki
Garbage Can Ghosts are large green ghosts from Luigi's Mansion. They do not attack directly, but instead munch on a banana, throw the peel on the ground, and then disappear. They have the highest Heart Points of regular ghosts, with 40 HP.
Garbage Can Ghosts also appear in Mario Power Tennis, along with some other varieties of ghosts. They throw banana peels into the court, causing players to slip.