I found that the easiest way to tame these guys is to get them stuck somewhere they cant flee or just grab them with a tuso and wait a long time, this has always been my oil gather dino is collect tons of oil from tje oil rocks and it gathers metal to obsidian is also one of the things he gathers.they arent agressive only when you get to close. They are slow but have alot of hp. And underwater raiding becomes easy.
Probably the most underrated Dino in the game! They can actually harvest a massive amount of metal, crystal, stone, flint, and obsidian. In Ragnorok there is a ravine by the volcano in the highlands underwater, One run in this ravine will give u 10,000 metal ingots and well over 10,000 obsidian from the same dark gray rock.