Go into the ocean in fjordor around the swamp island In the west of the map. You should see some turtles so to tame them find a school of fish and let them follow you to the large turtle. Swim beside it and try and get the fish to target the turtle. This will start the taming process keep doing this till tamed. For the saddle kill the turtles to get shell fragments and combine 22 of them with standard materials in a smithy. You can build on their saddle but don't cryopod if you have built. Make sure others see this
Ps: they are originally from genesis 1 in the ocean biome.