Maybe a Single Horn? (Washington CT)

 

https://www.flickr.com/photos/34580529@N04/albums/72157688389202965/with/36133485193/

http://rockpiles.blogspot.com/2014/12/norman-pomfret-vt-odds-and-ends-over.html

https://rockpiles.blogspot.com/2014/12/eggs-and-ends.html

https://rockpiles.blogspot.com/2016/12/horned-serpent-washington-ct.html

https://texasbeyondhistory.net/hueco/images/EP1-C2-plumed-serpent.html