If you breed your Egghog with a gingerbread mouse, you can get a sugar plum fairy. But first you need to breed the egghog and gingerbread mouse. It's not a quest in the storybook, it's just an "extra" side this month. If you look on the left hand side where the elf picture is, it shows you the egghog and how to get it. Once you do, it'll show you the mouse. You can also see their pictures if you go to "shop" under the available now icon. It's not required to win anything. But it's an extra if you'd like to try.