Magmasaur from ARK, released in 2020:

-lizard

-Has lava flowing from its body

-Has a rocky body

-Will incinerate you if you get to close

-Is pretty good at swimming

Dire Miralis from MH tri, released in 2009:

-lizard

-Has lava flowing from its body

-Has a rocky appearance

-Will literally boil you alive

-lives in the ocean

Hmm…