The best way to knock out a trike is to get it stuck on a ledge bellow you and just hit it with stone or if u have tranq arrows then those that's my way of taming one best way to do it if your a low level get it stuck somewhere
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.