We've heard kids call the structure just inside the department many things: the Hut, Book Nook, Book House, Tent, Castle, Fort, Mushroom, Tickle Tent (!) and last summer, Professor Trelawney's divination tower. During December, our kiosk (the manufacturer's name) morphs into: The Lollipop House, Ice Cream House, Candy Castle or Gingerbread Hut.
Let us know what you call it!!