The frigates that I saw in the 80s were single screw ships. Frigate were a bit smaller than destroyers, but like destroyers they are highly maneuverable on the ocean. Many of the frigates as well had a helo deck with a helicopter as well.
My ship, a Charles Adams Class guided missile destroyer, was capable of performing anti-sub operations (through our sonar and ASROCs) as well as anti-aircraft tracking and such with our twin harpoon missile launcher.
Here...I'll attach a photo or two of my ship, the USS Robison DDG-12.
BTW...cruisers are much larger ships and while I was never on one, I understand that a cruiser will typically serve as the "eyes and ears" of a fleet battle group through the use of its AEGIS system. If other ships in the battle group also have AEGIS (like the newer destroyers) the cruisers will typically lead the other AEGIS capable ships and serve as point or the clearinghouse for all incoming tactical info.
