While Brock still mostly talks in grunts and noises, he does have a few words albiet mostly unique.
Mamma and dadda - of course
Quinn sounds like "mamma" but at a unique pitch.. it isn't something I can spell
Zoe is said with a click... as in general "come here" for dogs
Yogurt is "yogurrrr"
Milk is "mmmmmm"
There have been a couple of other one-offs which were quite accurate, but nothing consistent yet