In Ron van Maanen's lists, he includes the Zeeland hired ship, the Sint Joris, which Jacob Wolphertszoon commanded in 1652 and 1653. This is the ship that I have seen called a "Scots frigate". Ron shows no sign of having seen the page that has dimensions and the gun list, but he does indicate that the owners were Paulus de Molter and Andries Rennij. By the way, the Sint Joris had a main battery of 6pdr guns.