From the Super Mario Wiki
Super Red Watermelons (also called a Fire Watermelon) are hot, fiery red watermelons (with red skin, red flesh, and black seeds) in Super Mario World 2: Yoshi's Island, its remake Yoshi's Island: Super Mario Advance 3 and its sequel Yoshi's New Island. If a Yoshi eats this Fruit, it will allow him to shoot Fire thrice, to defeat enemies, to melt Ice Blocks, and as a weapon in the Mini Battle Watermelon Seed Spitting Contest, which will deal more damage than a regular Super Green Watermelon.
Names in other languages
||Cocomero rosso (Yoshi's Island: Super Mario Advance 3)
Focomero (Yoshi's New Island)
Compound of the Latin foco (fire) and cocomero (watermelon)
- ^ Super Mario World 2: Yoshi's Island instruction booklet, page 24.