Remove the ice-cream balls from the freezer, and roll them in coconut. Return to pan, then return pan to freezer. Add orange food coloring to marzipan until it is the color of carrots. Shape marzipan into small carrot shapes, using a paring knife to make ridges. Remove one small ice-cream ball from the freezer, and make a face using Sen Sen for the eyes and mouth and marzipan carrots for the nose. Return to freezer until ready to serve. Repeat for the remaining small balls.
Remove a medium-size ice-cream ball from the freezer, and place Sen Sen in a row down the front to create buttons. Repeat with remaining medium-size balls. Remove large ice-cream balls from freezer, and stack a medium-size and a small-size ball on top of each large one to create snowmen. Lightly press balls together to adhere. Return snowmen to freezer.
Make the top hats: Roast marshmallows on skewers over a gas burner (or place marshmallows on a baking sheet under the broiler, and cook until browned, rotating every few seconds). Place each toasted marshmallow on a chocolate wafer, and dust with sifted confectioners' sugar. Place the hats on the snowmen just before serving.