You can still train fists on Hugin if you just ignore the talking to tutorial bird part, and there's a few structures he just conveniently reappears on inside your base after the first time you built them so even though he vanishes with each hit he also just comes back again in the same spot right after, again, as long as you dont actually talk to him.

greylings are also an option. They are everywhere anyway so they might as well be good for something.