Frozen Fever Elsa and Anna Dolls go shopping with the Barbie AppTastic Cash Register. These new Frozen dolls are from the Disney Frozen 2 short "Frozen Fever" where Elsa throws a birthday party for Anna. The Barbie AppTastic Cash Register works with your iPad or Tablet to help you shop with Barbie. This is also a learning toy great for toddlers because the toy cash register has a working calculator.