Pine? Spruce, maybe?

Um. Light-green or white-green things... That's a fairly uncommon color in nature, unfortunately, and most of the things people produce aren't something they'd be likely to name their dragons after.

Envy Dragons, maybe? That's traditionally associated with the color green. Maybe they're even more obsessively covetous than other dragon species!

...I'd go with Evergreen or Sage, myself. Moss, Celadon, and Tea are some shades of green that wikipedia gives that are towards the whiter end of the scale.