Frostburn

 is a Tier 5 Tank that upgrades from Flamethrower, Blizzard and Icegun at level 60.

Design
The is simply a Flamethrower with a Blizzard's turret on top. Unlike Blizzard's turret, it had a subtle chill indicator. It's main barrel also used a chill indicator that was quite wide, almost the full width of the Flamethrower barrel.

Technical
The Frostburn's turret fires chilling flares, while the front cannon fires the regular Flamethrower barrage while occasionally letting chilling bullets slip out of it.

Trivia

 * Due to only occasionally firing a chilling bullet from its Flamethrower, it can technically be considered a random ammo tank like Rummy or Sabliere.
 * This tank's name may be a reference to the debuff of the same name in Terraria.