They are "Christmas Eve mice"!
My Aunt Lilly shared this idea with us in our family cookbook quite some time ago. They are fiddly to make, but not hard. The base is an open Oreo cookie. The mouse's body is a maraschino cherry dipped in chocolate. Before the chocolate sets, stick the cherry to the bottom of a Hershey's kiss and insert 2 slices of almonds for ears, then set your mouse on the cream filling of the Oreo. The tiny holly garnishes came in a small jar like sprinkles.
"'Twas the night before Christmas
when all through the house,
not a creature was stirring,
not even a mouse..."