Watermelon (Yoshi's Island)
From the Super Mario Wiki
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Watermelons, also referred to as green watermelons, are normal watermelons (with green skin, red flesh, and black seeds) found in Super Mario World 2: Yoshi's Island, its remake Yoshi's Island: Super Mario Advance 3, its sequel Yoshi's New Island, and Yoshi's Woolly World. If Yoshi swallows the watermelon, Yoshi can spit seeds. Ukikis have many watermelons, some half-eaten, which only let a Yoshi spit out half as many seeds as a full watermelon. Ukikis use the watermelons to spit seeds. The seeds have the same effect on enemies as an egg.
Yoshi and a Bandit duel with spitting watermelon seeds at one another in the Mini Battle Game, Watermelon Seed Spitting Contest. Whoever spits the most watermelon seeds at one another until one's HP runs out as shown on the HP bar wins the minigame.
The Super Green Watermelon Special Item is available in Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3, and the All-you-can-eat watermelon! Power Badge is available in Yoshi's Woolly World. Using them automatically places a watermelon in Yoshi's mouth, allowing him to have its ability at nearly any point.
Names in other languages
Super Green Watermelon