It’s good to see a true mystery ran by the "What’s This" desk. The tool Leland Schlake submitted stumped many, prompting only a handful of responses, each one different.
John Glaser of Omaha, Nebraska, was the first to guess, assuming the device is a wagon hammer. It also goes by its other name, a wagon wheel wrench.
Other guesses included a cream separator wrench and a bung remover, but wagon wheel wrenches did look like this device so we are going to have to mark this one solved.
If you have any items lying around the farm and have been curious as to what they are, be sure to submit them with a bit of information about yourself and the item to firstname.lastname@example.org.