Snooze-A-Koopa

From the Super Mario Wiki

A Snooze-A-Koopa.

Snooze-A-Koopas (also known as Snooza Koopas) are bizarre-looking Koopas encountered by Mario in the game Super Mario Sunshine. Snooze-A-Koopas, unlike their relatives, have flippers instead of hands or feet and walk on all fours. They are also quite large and have a shell with a Yoshi Egg-like pattern on it. True to their name, Snooze-A-Koopas are mostly found asleep; Mario can rouse them with a blast from FLUDD. When awake, they will attempt to jump on Mario. If they miss and land in the sand, they will become vulnerable to a Ground Pound.

Mario does a Ground Pound on a flipped Snooze-A-Koopa.

Mario's first and only encounter with Snooze-A-Koopas is in the fourth episode of Pinna Park, where he must save several sunflowers who are wilting due to a large gang of Snooze-A-Koopas nibbling on their roots.

They also are the reason Yoshis left Isle Delfino, for the Snooze-A-Koopas have shells that resemble Yoshi Eggs.