Hes very clearly NOT Frostguard. I highly doubt hes Winter Claw, although he looks the part, hes far too friendly and protective of the weak to really fit in among those awesome savages (Cept Udyr, hes the non savage imo).
So my guys is hes Avarosan, considering his interaction with Tryndamere (calls him Friend), and Gragas (who is affiliated with the Avarosan tribe).
It is possible he is neutral though, his lore sudjests it. Which is why i would like a Red to Clarify.
Which side if he on?