De Moulin Bros. was a catalog company specializing in providing arcane trick props for hazing and initiation rites in fraternal lodges in the United States of the early 20th century. They were quite well known for their "goat trikes":
An inductee would ride the goat blindfolded while being pushed around the room by Lodge members. The DeMoulin Bros. first product was made in 1892 and quickly became a popular item, especially with Woodmen and Odd Fellow Lodges. [...]
Another funny factory addition that came on the above goat is... underneath the front part of the body a duck call is mounted with a rubber hose and a squeeze bulb. When the candidate was being wheeled around, you could make the goat quack. This was just more feature that added to the "degree of laughter" early Lodge Brothers engaged in when initiating new members!