Krote is the boss of mission 4 in 1941: Counter Attack.
Krote is a large fortification on treads. It has two elevators on the back to release enemy fighters, as well as two turrets mounted on the front and a flamethrower on the middle, which acts as the main weak point. The flamethrower constantly opens and closes, and both the turrets and elevators can be destroyed.
Krote returns on the final mission as a midboss. This version is much larger, with three elevators and a wall on the front which protects it.