Agrokk was born from a union of an Orc and Troll Shaman, as such speaking with the Elements came naturally to him. He was on his way to becoming a grand Shaman, but even after the Alliance and Horde forces invaded his Draenor from another world and pushed back the legion the lives of those who stayed behind were far from pleasant. His Father, who stayed behind after the fall of Archimonde, was a powerful Troll Shaman who tried to fit in with the last remnants of his Mothers Orcish Blackrock clan, but most were unforgiving of what his Horde brothers had done to them. due to this Agrokk was often tormented and beaten by the other kids.
(I'm still working out the rest)