Ice watermelon

Ice watermelons, also referred to as blue watermelons (or Blue Watermelons), are cold and frozen blue watermelons found in Super Mario World 2: Yoshi's Island (and its remake) and Yoshi's New Island. If a Yoshi eats one, he will be able to breathe three blasts of ice in the original game and five in Yoshi's New Island. The ice can freeze enemies solid, which can then be smashed to pieces. In Yoshi's New Island and Yoshi's Woolly World, enemies that are frozen will slide along the ground when touched by a Yoshi.

The Super Blue 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 ice watermelon! Power Badge is available in Yoshi's Woolly World. Using them automatically places an ice watermelon in the air suspended by a propeller, allowing a Yoshi to have its ability at nearly any point, as new ice watermelons will appear following him. In Yoshi's Island, using a Super Blue Watermelon allows a Yoshi to spit ice nine times instead of the usual three.

In Nintendo Puzzle Collection, ice, fire, and regular Watermelons cascade down the screen when a stage of Round 9 is cleared in the Action Mode of Yoshi no Cookie.

Super Mario World 2: Yoshi's Island

 * Instruction Booklet description: Places a Blue Watermelon in Yoshi's mouth. Allows Yoshi to freeze enemies.

Yoshi's Island: Super Mario Advance 3

 * Nintendo 3DS digital manual description: Puts a blue watermelon in Yoshi's mouth, giving him super-freezing breath.