So if Khorngor* = dogs, Tzaangor = birds, Pestigor = (diseased) goats then what are Slaangor based on? I can't say I've ever seen any artwork for them or even mentions of them in the fluff (AoS or WHFB), even googling them shows nothing or redirects to beastmen. Assuming there is no design precedent for them anywhere, then what do you think they should** be based on; or even better, if anyone is making some marked Beastmen which angle are you taking?
* I know the miniatures for these were 6th edition Bestigor with a bunch of Khorne symbols, they're mentioned in the fluff a few times as being based on dogs.
** Should in a fluff sense, I'm guessing short of a Slaanesh blood bowl team we won't see them released in the short or medium term.