Baba Buds

From Zelda Wiki.org

In The Wind Waker, Baba Buds are the bases of Boko Babas. Although these buds can be found unoccupied usually, a Boko Baba will occasionally be guarding it. By defeating the Baba, it will transform into a Baba Bud. If Link hops into a bud, it will launch him high into the air, giving him the ability to reach high places. By using the Deku Leaf, Link can utilize these powerful jumps to glide onto previously out-of-reach surfaces.

The first place these can be found is inside Forest Haven, where the Great Deku Tree will ask Link to climb the area by use of the Baba Buds. Once he reaches the summit, Link will be granted with a Deku Leaf.

Baba Buds are somwhat similar to the Deku Flowers in Majora's Mask. Unlike those flowers, buds can be used by anyone, not just Deku Scrubs.