To knock out a triceratops is not as hard as most people think. You don't have to have tranq arrows, a simple slingshot will do too. And if you're afraid of it hitting you whilst trying to KO it, try to get it stuck. Eventually it will even run away from you, as it is not able to hit you anymore!
This is what’s you’ll need to tame it:narco berries narcotics tranq arrows and some wood structures. Step one: make a taming trap. Make it big Enough so the trike can’t get out make a ramp into the trap and a small door for a survivor to fit in. Step two: Hit the trike run into the trap and go through the small door. Step three get on top of the ramp and start shooting it with Tranq arrows. Also DON’T SHOOT AT THE HEAD THEY HAVE EXTRA PROTECTION THERE.step four:once it’s knocked out put your narco berries and narcotics in the trike and wait for it to be tamed. If this helped please hit the arrow pointing towards the sky.