I have two beelzebufo and the easiest way to tame is to get on ground level and get a long distance away so it doesn't get you with it's tongue. Then once you knock it out you have done the hardest part. Then put meat in its inventory and keep it awake. Then you have a beelzebufo. But make sure to bring a strong dinosaur in case there are sarcos in the same swampy area.
100% melee damage is 20 base damage with beelzebufo sweep attack = 60 torpor over 10 secs. A second sweep attack within that 10 secs will only deal additional damage. 1000% melee damage will do 600 torpor over 10 secs with sweep attack :)
These oversized toads are easy to tame. All you need is a bola, tranq arrows and meat to tame them. Their food drops faster than their torpor, so you won't need that much narcotics. Be careful not to tame one if there are others nearby.
This is the most OVER POWERED animal in ark to get. If you see a LvL 100 don't miss out on taming it. I have taken out carnos and spinos with it with ease and it its great for getting around and knocking things out. GET ONE AS SOON AS YOU CAN!!!! PS. Great swimmer