When I was running around getting wood across the creek near my house, I saw one stuck in 3 rocks. I took out my hatchet and pickaxe, and I hit it 4 times, and then hit it with my fist until it went unconscious. I fed it about 50 berries, and boom! I still have him now. I use him to deliver to other people.
These guys are pretty easy to tame. I normally find them by the swamps and it’s quite dangerous there so get a club and hit it in the direction out of the swamp then try to corner it into some rocks or something then knock it out and feed it tinto berries, tamed pretty quick for me. Get a LOT of berries if you are planning on taming one of these guys.
Super East to tame, I just cornered it and clubbed it till it was unconscious. Then I feed it, that was the hardest part. I had to harvest berries while taming, so be preped if you want to tame one of these suckers, or just knockout near lots of bushes.