It looks like these guys are in the Hinterlands if it’s Troll rp or guild you’re looking for
And there’s
Painted Shields
Keep an eye out when they are online and go and hang around in the area that they’re currently camping in?
I think there is also a Troll discord you could join to find out when there’s community events on.
In terms of random role-play or walk up role-play, it doesn’t really happen unless in a neutral environment on Horde.