Even if we accept for fictional purposes that a full-grown man can shrink himself into doll size and change instantly into a superhero, the idea that such a superhero would be held in a prison cell meant for normal beings causes incredulity. There’s more than the usual suspension of disbelief in this tale from Doll Man Quarterly #4 (1942). Superheroes exist in a universe where they are extraordinary beings, but beyond the reader accepting their powers we aren’t usually supposed to believe that anyone would be as extraordinarily dumb as the jail warder in this story.
The Grand Comics Database lists Max Elkan ? (question mark means they aren’t sure) as the artist.