Dogadon is the boss of Fungi Forest in Donkey Kong 64.
Fungi Forest is the game’s fifth main level, a sprawling woodland that changes between day and night. After the Kongs collect enough bananas to open the boss route, Chunky Kong faces Dogadon in a rematch. The fight takes place on a platform surrounded by lava, where Dogadon attacks with fireballs, shockwaves, and ground-stomping attacks.
Dogadon is a large fire-breathing dragonfly-like creature and appears twice in Donkey Kong 64. Diddy Kong fights him first in Angry Aztec. The Fungi Forest encounter is the second battle, with Chunky Kong using TNT Barrels and his temporary Giant Chunky ability to damage the boss.
The other listed choices belong to different parts of the game. Mad Jack is the boss of Frantic Factory, while Army Dillo appears in Jungle Japes and Crystal Caves. King K. Rool is the game’s principal antagonist and final opponent, not the Fungi Forest boss.