The LA Times called him a bobbing pompom; MSNBC described him as the love child of Chewbacca and an Ewok; and meanwhile Malachy made appearances on the morning news shows sitting on a blue tuffet like Miss Muffett!
At any rate, you rate them by height from hillock, through hummock which gathers vegetation along the way, down to a mere grassy tussock, which seems to be rather like the famous tuffet (small tuft) on which Little Miss Muffet rested.