IKS Qo'rok

The IKS Qo'rok' was a heavy frigate that saw service with the Klingon Empire during the 24th century. 

In 2373, the Qo'rok discovered an incursion into Klingon space by Cardassian forces. The Qo'rok was able to delay the Cardassian forces long enough for a Klingon fleet to respond.