Snowball Yoshi is a power-up in the games Super Mario World 2: Yoshi's Island and Yoshi's Island DS. Yoshi can gain this form by landing incorrectly in a jump as Ski Yoshi. When in this form, Yoshi is invincible and can't jump or be controlled. When your Yoshi bumps into an object, the snow will vanish and Yoshi will be normal again.