Voadam
Legend
Paizo had their "Sandpoint Devil".Obviously there are "American" monsters that resemble folklore from other traditions. But that's because a lot of monsters are fairly generic, so I don't see using a monster inspired by American folklore or pop culture as an issue. For me, it would only become a distraction if it was identifiable as such. So if it was an obvious pastiche called "Jersydevilus" or some such.