Deku Nut
From Mariopedia, a wiki on Mario, Yoshi, Wario, Donkey Kong, Super Smash Bros., and more!
A Deku Nut is an item from The Legend of Zelda series, that also appears as an item in Super Smash Bros. Brawl. When thrown at an opponent, it stuns them, giving off the same effect as a broken shield.