His name is Oolo. He is the most easily flustered of the herbivorous Kikwi race.
Oolo is also involved in a side-quest to collect Gratitude Crystals. After Faron teaches Link her part of the Song of the Hero, Link can talk to Instructor Owlan. He will ask Link to find him a new species of plant to study. Link can then talk to Oolo, and use Scrapper to carry Oolo back to Skyloft. Bring Oolo back to Owlan's room, and he will reward Link with five Gratitude Crystals.