johnboat

noun, N. Amer., a small square-ended, flat-bottomed boat chiefly for use on inland waterways (COD)

“You don’t remember the ice punts? They just looked like a box. They were likely roughly, I’m saying, 20 feet, up to 25 feet. They had freeboard, about probably 3 1/2 freeboard. They were ramped front and back. Like a johnboat is today.”

“There was schooners tied up in Kingston harbour, and they had the johnboats or jolly boats, whatever you wanna call them, tied behind. They used to tow behind the schooners.”