To make these use a cookie cutter and trace the design onto green (or whatever color) construction paper. Here is a pattern you can use – just print out and trace however many you need. (right click to save and enlarge to desired shape)
Cut the hole for the nose on one and draw the eyes and mouth and back it completely with another cutout with no nose after putting in the lollipop or tootsie roll. Glue around the edges with hot glue or white school (non-toxic) glue.