Adventure mode (questions, solutions, hints, etc.)

[waveform]

Is it possible to get all three frog bosses in Marshan Swamp to subdue under King's rule?
If so, are there any special rewards?

SPOILERS FOLLOW
While I was sorting out their power struggle mess I noticed one of the conversation options was "I'm sick and tired of blahblahblah, the Swamp belongs to the King blahblah". Picked that and fight began. After I won it there was the blue flag waving at the top of the castle. This was the, umm, eldest of the frog bosses. The youngest one didn't mind being under King's protection. But what about the third frog boss? The one in the middle, actually? Bagaba or Squelch was his name, can't remember. Can he be "persuaded" somehow to accept King as his ruler?