Has they been any specific lore about the origins of the Troll and Tauren races?
Yes and no. As far as we know, Trolls had no divine ties in their creation. They just evolved, and came to exist over time. Their story could use more fleshing out, but it’s kind of established that they’re their own thing, no gods or Titans created them. That could change, of course. The Tauren have a creation myth which is most likely just a story, but this is a pulp fantasy setting, so it very well could be true to some extent. Unlike the Trolls’ story, the Tauren very much were a divine creation. The Earthmother (who could be the Tauren name for one of the Titans, perhaps) created the world, and with it the Tauren. Wowwiki has some decent information on all of that stuff.
