Unnamed in newland
The Many Tribes are large amounts of orcs and goblinoids that have sailed over from other continents.
Originally there were no goblinoids or orcs on the new continent, so when some groups of goblinoids and orcs heard of an entire continent with no competition they rushed to create boats and ships to take them across the sea for plunder and glory.
They knew that the humans were settling the southern part of the continent so they headed for the North. upon their arrival they fought and bickered, but eventually formed new tribes and clans, then started to move south. Eventually these tribes became known collectively as the Many Tribes.