The Mega-Glowbo is located in Glitter Gulch Mine. Go to Mine Entry 1 and walk over the wooden plank above the yellow water. Then enter the next door and jump into the water. Perform the Talon Torpedo on the rock with Kazooie's image on it, then enter that hole to find an Ice Chest. The Ice Key is located on the cliff above the sand in Jinjo Village. Inside the Ice Chest is the Mega-Glowbo which you can give to Humba Wumba to receive a transformation that changes Kazooie into a dragon.