The Snow Postman(1955)

On the eve of the New Year, several children write a letter to Father Frost asking him to send them a Christmas tree for the holiday, and then they make a Snowman who should take the letter to the magic forest. When midnight arrives, under the beat of a clock, the Snowman comes to life and, together with a small yard puppy, nicknamed Druzhok, sets off in search of Father Frost.