Froggy

"Ribbet, ribbet, Froggy here!"

- Prince Froggy

Prince Froggy (or simply Froggy) is a regal Frog Pirate who lives in a large swampy area on Yoshi's Island.

Super Mario World 2: Yoshi's Island
Froggy is the midpoint boss of World 3 in Super Mario World 2: Yoshi's Island, and offers a unique challenge. When Yellow Yoshi engages the Frog Pirate in combat, Kamek swoops in and shrinks Yoshi, allowing Froggy to swallow the Yoshi whole. The actual battle is between Yoshi and Froggy's uvula, with hazardous stomach acid dripping from the top. Shy-Guys (which appear larger due to Yoshi's diminished size) fall into the stomach, and can be turned into large eggs. Yoshi must throw the eggs at the prince's uvula. After each hit, the stomach becomes progressively redder. After enough hits, the stomach flashes various colors as Yoshi escapes through Froggy's intestines, and he reverts back to his normal size while Froggy lays defeated.

Super Mario-kun
In the adaptation of Super Mario World 2: Yoshi's Island from volume 14 of Super Mario-kun, Froggy swallows Yoshi, Mario, Luigi, and Baby Mario. Shy Guys fall on the group, but they are avoided. Yoshi attempts to hit the uvula, and although the egg bounces many times in the stomach, it misses the uvula. Finally, a giant Shy Guy lands on them. Yoshi eventually finds a star, which turns Baby Mario into Superstar Mario. Baby Mario then runs up the walls and gives the uvula a beating. This causes Froggy to defecate the characters out.

Tetris Attack
Prince Froggy reappears in Tetris Attack with a Clawdaddy for a partner, and is known simply as Froggy. He replaces the water fairy, Elias, from Panel de Pon. He is a friend of Yoshi's who needs to be rescued from Kamek's spell.

Trivia

 * The name "Prince Froggy" is a reference to a fairy tale involving a princess kissing a frog and turning it into a prince. However, in the original Japanese version, his name is "Gerogēro," the same name as ordinary Frog Pirates, tying in with how the rest of the bosses are given generic names that are typically just an identifier for their size and their species name; as he is not resized, he remains a generic member of the species.
 * He is the only boss that is not affected by Kamek's magic. In turn, he is also the only boss that does not explode, signifying defeat - Yoshi does the explosion effect instead. Accordingly, the effect might just signify the reversion of Kamek's spells. The latter is supported with Hookbill Koopa's defeat, where after the explosions occur, Hookbill Koopa bursts out of the destroyed shell in his original size, as well as the defeat of Big Baby Bowser, where upon exploding, he is clearly restored to his original size.
 * Real-life frogs lack uvulas entirely.
 * Although Prince Froggy's boss fight in Super Mario World 2: Yoshi's Island takes place inside his stomach, Toadies still appear to abduct Baby Mario if Yoshi is harmed and unable to retrieve the lost baby.

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