^^^^^ This is a FF10 and FF10-2 race called the Ronso. Most of them were wiped out in FF10 by Seymour Guado. I doubt we'd see them.
Viera and Bangaa seem more likely to me. They're such a noteworthy race we see in most FF titles that it'd make sense to place them in, especially after they gave us a custom race the first time around.
I want to say that the Bangaa seem most likely given the region considering how Viera were always forest dwellers or hinted at being more woodland-y.