Anna's Birthday Cake

Anna's Birthday Cake is what kept Kristoff and Sven on their feet/hooves while keeping it away from the Snowgies (that kept coming in bigger numbers) until Elsa brought the birthday girl to the party in the short film Frozen Fever.

Appearance
A blue icing Ice-cream cake with white swirls, sunflowers and a ice topping of the sisters; that was made by Elsa's magic (four times until she created the right one for her sister).

Lore
Before Elsa went to wake her sister up (and when the cake was brought out) she used her ice magic to make a ice topping of her sister for the finishing touch; she wasn't there for Anna's past birthdays (from the years of hiding from the world) and she wanted to make Anna's nineteenth a birthday to remember. That's why she changed the topping until she got it right.

While Kristoff, Sven and Olaf were waiting for the guests and birthday girl, Snowgies (that Elsa kept sneezing up) stared to 'play' with them until they fixed their eyes on the cake. The two grabbed it and kept it away from the little snowmen while Olaf played and hugged them; Elsa trusted them to make sure that 'nothing' goes for Anna's special day and that include keeping the cake safe.

When the numbers were getting out of hand and were getting closer to the cake, Anna brought her sick sister back to the castle to find her friends and birthday party. Kristoff told Anna that he loved her before getting Sven to cut it up and handing the slices to the guests (including the Snowgies).