What was funny about the snowman that Scout and Jem made in To Kill a Mockingbird?

The snowman was "funny" in that it looked very much like Mr. Avery, a neighbor who blamed the changing weather on children's bad behavior.  He claimed it was found in the Rosetta Stone.  Atticus recognized the similarities between Mr. Avery and the snowman, and told the children to make appropriate changes.  Scout and Jem borrowed Ms. Maudie's hat to turn it into a female, and Ms. Maudie referred to it as a "morphodite."