They are not actually a fully built beast tribe. They are much like the Qiqirin and Goblins. They are allies as often as they are enemies, mostly traders or travellers for good or for ill.
If you check out Maelvaan's Gate you will see a specially cross Mamool'ja that's been sitting in line to get his wares past inspection it's been a while, they basically only exist as enemies on Bronze Lake, a place wherein this one particular Mamool'ja is being extra annoying to the hot springs denizens not because of what he is but because he's one very lewd customer, so you gotta kick him out ("You can't stop the bathing dance"~)