In Strange State: Mysteries and Legends of Oklahoma, you can read about a creature that had the head of an alligator. According to legend, it terrorized Tahlequah in 1842. Now comes tell of a humanoid serpent skulking about Oklahoma's Delaware County:
“I turned around and right at the dip my four-wheeler immediately shuts off. I’m trying to pull-start it, and I started getting a little more freaked out because I heard some rustling off to the side. I look over and see a human-like shadow standing off to the side, but instead of being a normal human he had a snake-like head.”
The report comes from a fairly new blog entitled "OK? Awesome!" I look forward to seeing what other tales will come from this new site. The story also reminds me of an H. P. Lovecraft ghosted work involving a half-man/half-snake creature that was also set in Oklahoma. You will be able to read more about that story in the forthcoming work, Stranger State: More Mysteries and Legends of Oklahoma, due out later this spring.