This is a real tooth from a denversaurus dinosaur!
Denversaurus is a genus of nodosaurid anklyosaurian dinosaurs from the Late Cretaceous of North America. They resembled the more iconic anklyosaurs, but lacked the distinctive tail clubs.
These fossil teeth are from the Hell Creek Formation of Montana and date back to ~68-66 million years before present.
They come framed in a ~3.25" wide riker mount and can be shipped worldwide.