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
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.
Did you know that thorny dragons when they hit other dinosaurs 🦖 with their thorns on their tails, it actually knocks out the dinosaurs 🦕 not kill them, it mite kill the but most likely not and it takes from like 540 to at least 600!!