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.

Completely irrelevant but I think it looks kinda cute.

Argent can pick it up now after tlc 2

Be sure and name your first Thorny Dragon "Me So Thorny." Epic.

If you have a wyvern or argy, easiest way I found to tame is to set up a taming pen, 2x4 with single door frames on the first level, walls on the second(stone), with a Dino gate on one end. Go pick up your dragon of choice and drop it in! Super easy and quick.

Best at gathering wood and thatch and knocking creatures with a handy Smithy

Thorny Dragon eggs no longer works for kibble ingredients, for some odd reason.

Use a chain bola and then shoot it from a distance with traq darts