They were MiG-15, NATO code name Fagot, not MiG-17 Fresco. (Heh, I don't make up the names, NATO did, back in the non PC days of the late '40s in case of the Fagot).
MiG-15
Mig-17
Just remember that according to Websters a Fagot is a bundle of sticks to throw on the fire. It's the other spelling of the word with two g's that is non-PC.