Since there is little about his location and the realist is not on maps if you are working the Hunter Achievements...
When you get to the first circular bridge from Innothule zone in and take the right ramp up off the bridge and follow the path curving to to the right and there is a room with 3 frogs. This is the froglok realist room.
Edit...Apparently this mob is ultra rare if even spawning at all. I am on about 8 hours at the camp and no realist.
Edited, Aug 20th 2017 3:57pm by YoduhAgnarr