So they are basically like Kroot, but less bird like...i have a skaven army.
Maybe use the Kroot Mercenaries rules. I think they may be closer to the skaven then the IG are.
I can just see some drunk using that, but instead spitting on the girls dress.2. *lick finger, touch woman's dress/shirt/whatever*--"Oh, no, we have to get you out of those wet clothes."