User blog comment:FairyRaven/Fairy Tail Chapter 325: Unity, Review and Commentary/@comment-88.80.242.78-20130329102235/@comment-7418318-20130329103807

The King can't be the Pumpkin, because the King is seen watching the Baccus vs. Elfman fight, while the referee is also there.

Unless of course there is more than just one person in that costume, but I doubt that, after all the pumpkins voice is always the same.