There is legends of a tribe of dwarves in Hummel Park in Omaha, Nebraska. It is always passed off as urban legends. They also found what was described as a neanderthal skull there in the park while looking for the grave of a Native American chief (that was a burial ground). There is also been dogmen sightings there over the years.
Honestly it is the creepiest place I have ever been. There has people who went missing there and also it is a dumping ground for murder victims.