Very cool, if true

I think it is a schooner. It looks like it has a sail plan of fore-and-aft rigged on all 3 masts.

A frigate has guns. In the 18th and 19th Century they were ships with between 20 and 40 smaller guns and usually squared-rigged; smaller than a line-of-battle ship. Also in British parlance a 5th or 6th rate. Used for recon, signalling relays and commerce interdiction.

In the 20th and 21st century they are smaller escort ships (smaller than a destroyer) used for anti-submarine or anti-aircraft protection.

It is not a frigate.