You can get tranq darts at lvl 62

If you are on mobile you can craft 3 tranq darts at a time using 3 narcotics, 2 metal ingots, and 1 simple rifle ammo. If you are on other versions you can only craft 1 at a time using the same amount of ingredients.

Save them for a giga

Use tranq dart for bigger Dino’s it will make it easier but small dino sure you can do them but it would be a waste best tame for tranq darts are Rex,spinos,giga,etc.