I mixed a little bit of Torq's description of Groam with the knowledge that su_liam is working up halflings ("stoutlings") to the south, and I implied that the hillfolk, the indigenous people of the Tawaren and Groam, might have been stoutlings, or somehow related to the stoutlings
I never really pinned down what they are, but at the moment, I'm leaning toward something similar to a halfling, but perhaps a little taller and semi-nomadic.
I think there's plenty of room for variations on that particular theme. There may be several different strains of the race, expressing many different cultures.
Incidentally, I like what you've done with the wiki entry for the Tawaren Basin. I kept futilely checking my own map looking for the landmarks you wrote about. Feel free to work up more data within the western part of Tawaren if it suits you.