The best you can do to knock out the trike is to find a rock that only you can climb on then shoot the trike with a sling shot or tranq arrow and if he runs you follow and keep shooting him then retreat back to your rock so he comes back an keep doing that
They are easy first get slow level if you are start game. Preferably a lvl1 to a lvl 10. Then knock it out with a slingshot or tranqs. I run in circles and knock it out. After that let starve for 3-5 minutes then feed green kibble ,crops , or mejos. After that give either narco berries or narcotics. Then you got a trike.
So what you do is get a lot of the purple berries and those black ish berries. Go on a higher rock that the trike cannot get to u. Use a slingshot and aim near the body. The head has too much armor on it and cannot knock it out. The body is the most Vulnerable. The black ish berries will make its Unconsciousness go up and it saves you a good amount of time to tame it. I hope this info was good enough!