Pro tip:This one are easy to tame if you stand on a rock with a boomerang/bow/crossbow/rifle(crouch when he shoots thorns to avoid getting tranq and falling into his very extremely dangerous gums)and throw/shoot at it, just go for low levels if you are being
If you are going to tame one of these with no dinos, be sure to upgrade your movement speed and get tranqs. When you see it whip its tail forwards move to the right you will dodge the shots. This worked for me.
A good thing to do for a lot of creatures is build a cage out of door frames and ramps once the creature is in just shoot it with tranq arrows or darts but the creature has to be big enough to not walk through the door frame