Ice Flower

From the Super Mario Wiki

Ice Mario in Super Mario Galaxy.

An Ice Flower.

Ice Flowers are the opposite of Fire Flowers. Ice Flowers appear in Mario & Luigi: Partners in Time. The move is just like a Fire Flower (shooting Fireballs), but in the case of Ice Flowers they shoot balls of ice. Ice Flowers can randomly lower the enemies' Attack, Defense, or Speed.

Ice Flowers reappear in Super Mario Galaxy. Ice Flowers turn Mario into Ice Mario, which lets him cross water and lava by turning it into ice as he steps on it. The music for it will get faster and faster as it runs out, until it ends.