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Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
Fat Guys make their first appearances in Super Mario World 2: Yoshi's Island level Lakitu's Wall, and are uncommon enemies throughout the rest of the game. They come in two colors: red (which initially walk but will run if Yoshi stands on them) and green (which are always running). Fat Guys attack by simply walking or running back and forth, much like regular Shy Guys. Their left foot often disconnects, which may or may not be a graphical error.
When Yoshi has three giant eggs at his disposal, all of the Fat Guys will disappear until Yoshi uses at least one of the giant eggs.
Yoshi's Island DS
Fat Guys returns in Yoshi's Island DS, where they behave similarly to their first appearance.
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