How to tame stego, is easy! The way of taming stego is same as triceratops. Get tranq darts, that unlock at lvl 21. Climb a rock or a high local and start shooting it. When it fall unconsious, it will need lots of berries, like, 11 to 17 of differents of them, and the taming bar will increase fastly. You just cant of course feed it narcoberries bc it will just increase his torpor. Andddd you have a new friend!
So I tried knocking it out with a slingshot and it didn’t really work and was taking a long time, My slingshot eventually broke so I used a cross bow and tranq arrows. I hit the stego 4 times and he fell unconscious! now I have a stego!!