Deku nuts are items that appear in Ocarina of Time and Majora's Mask. They stun most enemies and can be dropped by Deku Link. It is believed that Sheik uses these to disappear in Ocarina of Time. They are also items in Super Smash Bros Brawl.
In Super Smash Bros. BrawlEdit
In SSBB dizzy the opponent or whoever that see the flash when the nut explote.