Sure are! Available in Colorado, although I’d say they more of an adventure food tourist attraction rather than something that’s a regular menu item. Apparently they’re even served at Coors Field.

https://denvergazette.com/outtherecolorado/blog/8-best-places-for-rocky-mountain-oysters-in-colorado/article_f26b953e-2da1-5779-af9a-c553ea769782.html