Unlikely, since Teir tells Skywise he received his Troll sword from his father, who received it from his father (and that's all he knew about it). Which leads me to think his father was full Go-Back raised.
Kahvi might have encountered this separated Go-Back tribe, took leadership (again), and finally left (again) because she really can't stay in one place more than a few decades :)
I am not surprised that Go-backs could develop new powers. Even if they don't experience Recognition like other tribes, they may produce offsprings who answer their most important needs. This animal-control power is the best thing you can have when living and hunting in plains.