Since privateer voyages were essentially money-making enterprises, they chose ships that would be fast enough to overhaul a merchant ship, and big enough to capture it, hopefully without actually having to fight. This meant that most French ocean-going privateers were fast, weatherly vessels of 200-500 tons. Their job was not to fight enemy ships of war—this happened only when the privateer could not escape, or very occasionally if the privateer encountered a smaller enemy warship. To my knowledge, no privateer even approached the size of American 24-pdr frigates (1500 tons), and since there were only three of these, there is no way the Americans would transfer one to the French. The French had a few 24-pdr frigates in their navy, but again none became privateers.