Proposed Canon
First Appearance: TBFGK 21
The only Woodsy Elf named in the First Book was Tarfu.
They are the only forest-capable units (along with Gumps) in the CoalitionErf-b1-p046a. It is not clear whether that gives them any bonus in forest terrain or simply allows them to move in forest terrain at all.
Woodsy elves are a clear analog to "Wood Elves" or "Sylvan" elves of other sources. This makes it likely that they receive no negatives due to wooded terrain (commonly movement and archery based deficiencies), and may even receive a significant combat bonus when fighting non-woodsy opponents in a forest hex. They also are likely the best (or nearly best) archers among all regular units on erfworld.