Rogue Taxidermy is a folk-art form where you use dead animal parts to create some new, unique creature that never could have existed... but should have! So appropriate for Halloween.
The folk art form of rogue taxidermy seems to be rooted in the midwestern United States, and can be considered a hallmark of Midwest Gothic. The most famous group is the Minnesota Association of Rogue Taxidermists. One typical truckstop chimera is the jackalope:
Rogue taxidermists got so carried away with the jackalope thing that they managed to infuse the critter into the North American culture at large, and now no roadside truckstop is complete without a mounted jackalope head on the wall. There's jackalope tattoos and faux nature documentaries and hundreds of photo manipulations. Jackalopes are world famous, a triumph of rogue taxidermy! Future popularity to a similar degree may be won for the hodag:
Or the fur-bearing trout:
As you can imagine, there's a huge crossover between the rogue taxidermy and cryptozoology worlds. Whether through intentional attempts to hoax the public, or tongue-in-cheek attempts to hoax the hoaxers by going "Look, I found one!"