So I'll tell you why Rise of the Guardians and Frozen are alike.
1.) Anna and Tooth are similar
Both are sweet and caring. They care too much for their kingdom. Well yes, you never heard that much about Anna, but she has to go look for Elsa to save Arendelle. While Tooth Fairy wanted to save her fairies from Pitch.
2.) Elsa and Jack Frost are similar
Both are just so similar to each other. They are both very protective of their siblings and they both have ice powers. Also, Elsa and Jack were both alone for many years. Elsa was alone for 13 years while Jack was alone for 300 years.