I really like the troglodytes (I must have missed them the first time around).
Yes, you have done the Yeth Hounds justice. I kind of opened them up to interactions when I mentioned their habit of coexisting with creature's near their den and I feel like you have posted consistently with the idea. Yeth Hounds should have no problem outsourcing their fear to other creatures, but of course this habit doesn't always mesh well with the habits of the others.
You do a fine job writing these Kol Korran, but I'd probably make a new creature myself should I want to add a particular one. I'm currently thinking about Tendriculos but may chose to do another instead.