mummer (n.)

"one who performs in a mumming, actor in a dumb show," early 15c., probably a fusion of Old French momeur "mummer" (from Old French momer "mask oneself," from momon "mask") and Middle English mommen "to mutter, be silent," which is the source of mum (interjection). "[S]pecifically, in England, one of a company of persons who go from house to house at Christmas performing a kind of play, the subject being generally St. George and the Dragon, with sundry whimsical adjuncts" [Century Dictionary].