The Bog Giant is one of the smaller members of the giant family - as their name suggests, they primarily live in swamps. Having developed some oddly amphibian characteristics appropriate for their surroundings, these creatures stalk their territory in search of large reptiles such as black dragons and crocodiles to hunt and eat. Despite being their prey and their main source of clothing, crocodiles are venerated by bog giants, and are sometimes kept as pets.
This image was drawn by yet another illustrator-animator, this one named James Lancett. He's done a really nice cover for the Puffin competition for James and The Giant Peach.