Growleywogs are wicked, disagreeable creatures who live outside the Land of Oz.
They are of remarkable size, but are all skin, bone and muscle, there being no meat or fat on their bodies at all. Their powerful muscles lay just beneath their skin like bunches of tough rope.
Growleywogs are disagreeable and overbearing, and are unsociable even among themselves. They are ruled by the Grand Gallipoot.
The Growleywogs joined the Nomes in a plan to conquer the Land of Oz. They were promised twenty thousand Oz people as slaves, but they planned to loot the kingdom and perhaps enslaves the Nomes as well.