Really Easy Tame. They usually spawn in South zone 1,2

Step-1 First get the resources before hunting them get 10-15 narcotics and and bring some prime raw fish meat

(You get them by fishing) just make sure it doesn't spoil

Step -2 Get On A High rock with your tame you will need it when spino is fleeing because of the torpor. They run really fast

Step-3 keep shooting with tranq crossbow bring a lot of arrows make sure there is not other spino around

Step- 4 Feed it raw fish meat I'm assuming you are hunting 30-50 lvl it should take about 10 minutes I still recommend feeding it some narcotics

Name it razorback

Boom you have a spino now!