Looking at the available terrains & expertises for different races, storm giants especially seem way too thematically restricted. In general I think that Forest should basically be a terrain and Survivalist an expertise choice for every race. I.e. less forcing of "common" or "most likely" racial background for rangers, but rather adding more variety/combos to play.

As far as stormies go, besides Forest & Survivalist, adding at least also Marshdweller (keeping with their wet theme) & Explorer seems reasonable (I'm just thinking in terms of expanding their very limited options, not in the skill sets, but I doubt there's an über ranger build in there).