The K'T'amar Torpedo Cruiser was developed by the Klingons as an advancement over the existing D6T Torpedo Cruiser.
The K'T'amar exchanges its heavy photon torpedo and other light weapons for three photon torpedo bays. This allows the K'T'amar to saturate the target, increasing the chance of torpedo hits considerably.
Adam Baird pointed out that the Klingon cruiser in TMP fired several Photon Torpedoes in rapid succession at V'ger. It sounded like a good suggestion for a variant!