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.
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
To knock out this creature you can use a flying creature to reach a tall stone or hill that it won't be able to climb then shot it with your tranqs, if and when it suits spikes at you move back slightly to dodge them. Good luck.