Returning to whether CYANE was a frigate or not:

"...CYANE,22, (1806 Topsham. Captured 1815) She was rated a 22-gun ship and mounted that number of long 9-pounders on her main deck. However she was also armed with eight 18-pounders and two long 6-pounders on her quarter-deck and forecastle...."

(from: SHIPS OF THE OLD NAVY : A history of the sailing ships of the Royal Navy by Michael Phillips
http://www.cronab.demon.co.uk/INTRO.HTM ).

As all the listed commanding officers are shown as "Captain", and, as the a frigate was the smallest Captain's command, I would suggest that Cyane was indeed a frigate.

W