There are five types of Deconstruction Zones:

Circuit Breakers (shock)
Cold Storage (freeze)
Molten Mayhem (fire)
Radioactive Recycling (poison)
Savage Salvaging (normal/none)

Yet scorcher (flamethrower) gremlins can appear in all of them, which for the poison/shock/freeze levels, doesn't make a lot of sense.

Really for those levels, the "flamethrowers" should be firing out their respective status effects.

i.e.

a "cooler" (freeze)
a "shocker" (shock)
a "chemist" (poison)