Reptiles didn't use language tokens, that's for sure. We don't have reptilian brains anyway, it's just that part of our brain architecture evolved from a common ancestor. The stuff that might function somewhat similar to an LLM is most likely in the neocortex. But that's for neuroscientists to figure out, not computer scientists. Whatever the case is, it had to have evolved. LLMs are intelligently designed by us, so we should be a little cautious in making that analogy.