It's a smaller stego with lots of spikes. I do not recommend petting it.

He took me on a trip across the map...Don't agro them

If you accidentally press E and happen to land on these things just pretend it's a mobile giant Lego piece. It will make the experience at least more bearable

It's best to leave them alone unless you want to tame them. They act like spike walls, so you and your dino take damage when you melee it, and it's a lot of damage, even low level ones do a lot. If you want to kill one, it's best to use ranged attacks like a gun or a wyvern blast.