What is this triangular Christmas ornament called?

When I was a kid I remember these traditional paper ornaments that were like elongated upside-down pyramids (I can't remember if they actually had 3 or four sides in addition to the top). The top opened to put candy inside. I can't remember what they were called, where the tradition comes from, etc; and I would like to find an online printable template for them. Any and all help in finding these online and more information about them would be greatly appreciated.