The German Way – This very robust site currently includes the lyrics to “Christmas Carols in German and English”:
https://www.german-way.com/history-and-culture/german-language/german-christmas-carols/
German Christmas Songs publicly shared on YouTube. These three songs are traditionally sung during Weihnachtsfest at the Pommerscher Verein celebration.
(All songs are property of the people who published them.)
O du fröhliche, o du selige (Oh, How Joyfully)https://youtu.be/t-DN1AKySa8
Ihr Kinderlein Kommet (Oh, Come Little Children) https://youtu.be/PxnHSM023GY
Kling, Glockchen, Klingelingeling https://youtu.be/Yh6BkM_OnOQ