Fire and poison dragons seem to only make more fire and poison dragons. So far, they do not create any other hybrids.
There are a few possibilities. Those are Scorch, Firefly, or Lava.
a earth dragon
Lava dragon
You can get any of the following dragons, Scorch, Firefly, Quake, Obsidian, Lava, and Crystal.
You get a lava or a earth dragon
When I got mine it took 6hours to breed,I used a lava on the left and lightning on the right but you can also try earth on the left and lightning on the right or lava on the left and crystal on the right.
You could get a swamp, crystal, rainbow, tree, moss, mud, quake, seaweed, or cactus from this combination.
Fog and lava either makes panlog or rainbow but it could make other things too like I got blazing too with fog and lava
Watermellon dragn
Lava and mud!👍
Lava and Mud Dragon
It varies