The clay dolls made at Takaya Shimogawara Yaki Clay Doll Factory in Hirosaki City have a history of 200 years.

All of them have a mouth on the back that blows air into them, making them clay flutes.
Since ancient times, in Japan, there is a legend that if you put your mouth on the soil, it will keep insects away (preventing night crying, tantrums, and seizures in children).