I hate to break it to you fellows, but World of Warcraft isn't real. The trolls in the game do not really exist. So no, that's not what trolls "really sound like." They are imaginary. They are cheesy, badly ripped off stereotypes of other races, as were the goofy ning bong asian aliens in the star wars prequels.
I have a life though, so you can't really relate to me, so I have to explain the obvious as if I were explaining them to a child.