King frog

 is a boss the player doesn't fight in Enemy 585. He is a boss the Bearded Man fights. He makes his first, and only appearance in the intro for Enemy 585. King Frog in the intro, is holding the Princess and Bearded Man's Guard Dog captive. When the Bearded Man enters the room where they are being held captive, the Frog King is there, standing on a collapsible bridge. The Bearded an jumps over the Frog King and lands on a button behind the King, collapsing the bridge, and plummeting the Frog King into the below Lava. The Bearded Man, Princess, and Guard Dog escaped the Frog King's castle.

Castle
The Frog King owns a castle, which is seen on the first level of Enemy 585.

Trivia

 * statues are seen in platforms. King Frog's face is also seen on banners in he game. also, when the player completes a level, King Frog's face is seen.
 * King Frog is obviously based off Bowser, his castle based off Bowser's Castle.
 * The battle between King Frog is very similar to the final battle between Boser and Mario in New! Super Mario Bros..