The Skaal just live in a different hold of Skyrim. The Nords of Hjaalmarch would differ slightly than the Nords of The Rift. Likewise, the Skaal are just a little different than the mainland Nords but they are essentially the same race.
Hell no, they're worse than the nords but that doesn't make them a race. After seeing them hunt down a cute Netch family they are KOS for me! They didn't hunt the Netch because it was hostile or because they were hungry... THEY DID IT FOR THE LULZ! Fuck those guys!
But on a serious note they do use the pieces of the netch. The game just doesn't have a animation for them cutting them up and peeling the shells off, and stuff like that.