some vocabulary in french :
Merry Christmas = Joyeux Noël
Happy new year = bonne année
Santa Claus or Father Christmas = Père Noël
Xmas tree = Sapin ( de Noël )
Christmas dinner = réveillon (in the evening on december 24th)
gifts = cadeaux
wishes = souhaits
Xmas carols = chants de Noël
White Xmas = Noël blanc
....ask if you want some more