Here are my four elemental dinosaurs. They don't come from a planet; they all split from an entity from outer space that formed when a black hole consumed a highly radioactive star and the being came to Earth to feed on matter, then it was defeated by Sir Hottie McHottie throwing microwaves at it.
...Boy, that must sound strange to you.
https://toyhou.se/1308611.dr-fire
https://toyhou.se/1431787.dr-water