Pilliwinkle's Playthings[1] was a shop specialising in wizarding toys, located in Horizont Alley in the wizarding quarter of London. It was located next-door to Florean Fortescue's Ice Cream Parlour.
The front window had a bunch of troll marionettes in ballet dress on display (presumably inspired by the Troll Tapestry at Hogwarts, depicting Barnabas the Barmy's foolish attempt to teach trolls how to ballet). Casting the Dancing Feet Spell on them made them dance around.[2]