I use snowmen in my room for everything! They are the best Winter Decoration--non-denominational, easy to make out of paper and even easier for students to draw.
The Snowman Speaks is my way of using snowmen to facilitate good communication skills! I'm proud to be the first (and only) special education teacher to be named Teacher of the Year. In my classroom I have always used voice bubbles with students with autism who are struggling with communication. The student may not say hello to you, but he might have the snowman say hello.
For students with no communication issues, they always have a fun time creating jokes with their snowmen and use them for more complex communication.
Good luck in class and I hope you have fun making the snowman speak!