From the Super Mario Wiki
Strollin' Stus are creatures native to Isle Delfino that are found in the game Super Mario Sunshine. They are squat and pudgy, somewhat similar to Goombas, and have a bulbous nose, pink high-tucked spotted trousers, and a waddling gait. They are the most common variant of Stus encountered in the game. They will charge at Mario should he get too close. If sprayed with water, they flip over, allowing Mario to spray them away or walk into them to kick them away. Strollin' Stus can be defeated by jumping on them, by having Yoshi eat them, or by spraying or kicking them into a wall, causing them to splatter and occasionally release Coins. If Mario jumps on a knocked-over Stu while multiple have been sprayed, all of them are defeated, and if Mario does this with at least three Stus, a 1-Up Mushroom appears in the place of the jumped on Stu.
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