I recall an alien befriends a young boy and at Christmas the boy is given a present from the alien dressed as Santa. The gift is a small toy version of its spaceship.
I cannot believe I know this, but it is the French Canadian film le martien de Noël from 1971. Two kids meet a Martian out in the snow, teach him a bit about the Earth (or at least, Quebec), and at the end, he dresses up like Santa and gives them a model of his ship. I watched it several years in a row in elementary school
Here’s a quick video summary.