Well yeah now that they're here. But my understanding was that the ganglion and their race of underlings only arrived recently as well, no? Before that, it doesn't seem there were any locals except nopons.
I was under the impression L's race had been there a while too (IIRC he says 'since time of antiquity', aka long ass time). Either way the Nopon can trade with each other when their caravans crossed paths, like humans do in the real world.
Though real life nomadic tribes tend to be herders, not sure what the Nopon do between contact.