Have been successfully breathing trough my mouth and using my own tongue for the same effect since I was a little kid. Takes some practice getting the airflow r

Have been successfully breathing trough my mouth and using my own tongue for the same effect since I was a little kid. Takes some practice getting the airflow right, but it's the same physics: get it cooled down by the incoming air and warmed up on the way out. It surprisingly has enough thermal capacitance to have a noticeable effect.