How to tame except I actually have grammar

Get a turtle and level up health. 5,000+ should be good.

Get 50 black pearls and a cryopod with your turtle in it.

Take a fast sea mount (ichthyosaurus would be fine) and start searching for tuso. (They spawn at the bottom of the ocean)

If you can't find one go on a killing spree with a mosasaur or whatever to open up spawn spots

After a bit start searching again and when you find one deploy your turtle and have the tuso grab it. This should be easy since they're aggressive. When it grabs the turtle, go near it's beak and feed it the pearls.

And now you have a tuso!