Tappy Run Xmas is probably my favorite on this list, despite basically just being a Christmas-theme version of Run Tappy Run. Both of them are solid (and adorable) endless runners with multiple characters and loads of replayability, but Tappy Run Xmas has that holiday flair that's so hard to resist.
This one's appropriate for all ages and can be played by just about anyone. It does have a few ads, but they do not detract from the winter theme nor the gameplay. You can get your cute Christmas run on by downloading it on Google Play.