do they know it's christmas singers in order

Yes, they do know it's Christmas! They're both singing their own versions of "Do They Know It's Christmas?" by Band Aid, a charity song that was originally released in 1984 to raise money for famine relief in Ethiopia. Since then, it has become a beloved Christmas song and a regular part of the holiday season. So, both the snowman and the reindeer are familiar with the song and are singing it in their own unique way.