Celswine, Farenthog, Warhog

Celswine: It can easily pick up a difference of temperature in the area, helping it find insects in the ground for it to eat.
 
Farenthog: It can change the shape of its veins to increase blood flow in certain areas. That increases heat in the area, and oftens uses this technique in its snout to increase fire power.
 
Warhog: Although its tusks have no blood in them, they can conduct heat. Direct contact with them can inflict 3rd degree burns.