Blue Watermelon

From the Super Mario Wiki

Blue Watermelons are blue Watermelons found in Super Mario World 2: Yoshi's Island. They may be cold, but it is uncertain. If a Yoshi eats it, the dinosaur will be able to shoot three blasts of ice. The ice can freeze enemies solid, which can then be smashed to pieces. In the Game Boy Advance remake, Yoshi had to freeze two Tap-Taps and leap off them to access an otherwise unreachable area in Level Special 5, Items are Fun!.

Super Mario World 2: Yoshi's Island Items
10 Point Star • 20 Point Star • Blue Watermelon • Full Egg • Magnifying Glass • POW Block • Red Watermelon • Watermelon • Winged Cloud

Fruits

Apple | Banana | Bean Fruit | Berry | Black Apple | Blue Apple | Blue Banana | Blue Berry | Blue Watermelon | Bubble Berry | Cherry | Coconut | Crystal Berry | Dried Fruit | Durian | Giant Banana | Golden Apple | Grape | Green Banana | Heart Fruit | Keel Mango | Lemon | Lime | Mella Yella | Melon | Papaya | Peach | Peachy Peach | Pineapple | Pink Apple | Primordial Fruit | Red Apple | Red Berry | Red Watermelon | Star Fruit | Strawberry | Watermelon | Yellow Apple | Yellow Berry