After clearing the entire town for hours, I think I (with the help of my wife) nailed down one verified spawn location. Its in the second building to the right when you come up the ramp and enter that first cluster of huts. Its a brown colored hut and he spawns in the NW area of that hut. Seems to be a 30 -60 minute respawn time and aggros when green (the other mobs in that hut do not). Location is -1132, -1795. Got my last 2 shields off that location.
I've only ever seen these in brown huts. Think thats your best best if you need to camp these guys is clear the brown huts. Seems pretty common. Took me less then two hours clearing 4 brown huts to get 4 of em.
These guys, who are very common in Krup (the froglok city in the center of the zone), drop the ton totem used in the quest for the iksar illusion spell. They are far more common than ton warriors, and drop the totem quite often, about 50% of the time at least. They are found in a building right next to the ramp up to the city. A bit trickier camp to break, but if you can do it, you'll get your ton totem in far less time that it takes to find ton warriors and get the totem from them!
I couldn't even find a warrior but found this fellow and he dropped the totem. Camp is an easy break actually if you are a chanter. I only killed this one froglok while searching for this.
I was invisible the whole time looking for this guy, then rooted him, mezzed the adds. Choked the Krup Guard. Calmed and memblurred the adds then finished off the Krup guard with nukes. Adds walked back to their spawn locs. I invised again and walked away.
I was 41st when I did this, so a bit high level, but I think it possible to have done this at least 10 lvls ago if not earlier. Just have to be patient and careful.