Anna's birthday cake is an ice cream cake that was made in celebration of Anna's nineteenth birthday. Kristoff and Sven had to protect the cake from the Snowgies until Elsa brought Anna back to the castle.
Elsa used her magic to make an ice topping on the cake before going to wake Anna. Just after completing the cake, Olaf took a bite before being caught by Elsa.
Kristoff, Sven and Olaf had to keep an eye on the cake and courtyard while Anna and Elsa went around Arendelle collecting presents. Soon the Snowgies arrived and tried to take the cake for themselves, leaving Kristoff and Sven to take turns juggling it to keep it away from the determined snowmen.
Soon the jostling intensified with more Snowgies arriving and overwhelming the trio. Just as it seemed that the cake was lost, Anna and Elsa arrived at the castle gates to see the chaos; the cake was procariously balanced atop a huge mound of Snowiges, with Kristoff, Sven and Olaf on top. Order was quickly returned and the cake was presented to Anna by Kristoff; the Snowgies then carried it over to Sven who sliced it with his antlers, dividing it up and sharing it among the Snowgies and guests.