What Is This Thing?

It's a spring loaded hanger for Peking Duck. The carcass is normally hung to dry the skin. You squeeze the two prongs together to fit the hanger into the cavity, and then let them spring back so the hanger won't come out. Now the duck can be hung conveniently by the ring!
. . . or something.

Nice to see this sort of quiz back again.

These are dedicate tongs for removing pickled human toes from brine, such as might be found in a Klondike saloon.

Ah! This is the calipers of the long-forgotten science of linguanology, an off-shoot of phrenology. Linguanology theorizes that the thickness and width of your tongue determines your intelligence and personality.

A portable set of hand-grip exercise device. These were a must-have for any self-respecting athletic person in the 80s. They could hang from a key-chain to avoid taking away precious fanny-pack space.

A librarian posted this tool. Therfore i expect it to be some special librarian tool. For removin markes in regiosters or such stuff?