I was searching on Wizard101 Central and I found a monster called the "Fire Demon." If he was a mob traveling around, I would've known he was there, because Krokotopia is my favorite world.
Fire demon
Rank 4 Boss
750 health
Creature Class: Unknown
School: Fire
Boost: 30% Ice, Resist: 60% Fire
This creature deals an unknown quantity in fire damage per pip