From Blaseball Wiki

THE MAW was the official mascot of the Canada Moist Talkers.

Before the opening of The Forbidden Book, THE MAW resided in the centre of the Moist Talkers' then-home field, Spittle Park. It was a ginormous, sodden mouth filled with rows of razor-sharp teeth, waiting in the centre of the diamond for an unsuspecting player to fall in. Unfortunately, nobody did, and it retired to a cavern deep beneath the earth at the beginning of Season 尾2. It was then replaced by the Belligerent Phlegm Receptacle.