Depending on who's telling the tale, it's either called the “Loveland Lizard” or the “Loveland Frog”... but one thing all the sightings have in common is the description of a squat, greenish creature with leathery skin and webbed hands & feet that's said to be lurking in the woodlands around Loveland, Ohio.
Image: Scary for Kids
The first sighting of the Loveland Monster (or monsters, plural) is dated 1955, from a man who glimpsed a family of small, squat humanoids with wrinkled skin and frog-like faces huddled beneath a bridge; the man also said the creatures secreted a mucus-like substance, and one of them carried some kind of weapon that emitted sparks.
The next significant sighting came in 1972, when police reported seeing a similar creature roughly three or four feet tall, but resembling a lizard more than a frog; also the beast was said to be covered in matted hair and possibly had a small tail. After firing on the creature, officers said it escaped by diving into the Little Miami River.
More history of the Loveland Monster can be found in the book It Came From Ohio: True Tales of the Weird, Wild, and Unexplained by James Renner.
Of course, if you prefer more traditional mystery monsters, you'll want to check out this recent Bigfoot sighting in Canada.