I would make it a racial feat, but ranged natural weapons are weird.
EDIT: Also, I gave them acid resistance because it makes sense.
I'll make it a racial feat. A natural ranged attack is unusual in 3.5 D&D, but probably not too powerful. It's roughly equivalent to an at-will cantrip.
Most or all of the abilities that Link gets in Majora's Mask are unique to that game. They make good racial feats, but they're not the best for PCs.
The Deku hovering ability doesn't work well as a racial feat. It doesn't make sense for dekus to progress to full-blown flight, so I'm not sure how to write a scaling racial feat for it. (A feat for feather fall at early levels is useless at high levels, when falling damage isn't as much of a deal due to hit points and wizards and magic items).
I added a seed spit feat for the deku. I'm thinking about ways to make it scale with energy damage at higher levels.
EDIT: Made its damage scale with level, but it's slow.
Good idea. I'll give them camouflage and make it replace the AC bonus.