Magmite

The Magmite is a large wormlike creature that swims in lava. It can be used as transportation across the lava lakes of the nether, but only if you have hoglin meat in your hand. You can mount them at any time, but without hoglin meat, it'll just go back into the lava, where you'll burn to death. It works similarly to how riding a pig works, you aim where you want to go with the hoglin meat, and that's the direction the Magmite swims. Magmites aren't able to be tamed. Maybe you could put a chest  on one though.