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