The Suspicious-class, or PIH-class, was a type of starship used by the Klingon Empire in the 2290s decade.
History and specifications[]
These small ships filled a variety of roles which included; science vessel, troop transport, armored freighter, sensor picket ship and as a battle frigate. It was not a popular design among the Klingons. In addition to this, it was actually an old hull design that dated back to the 2270s. It was noted that there were about three hundred of these starship hulls in service. They were noted on being slow, ponderous despite their small size but did make up for this in terms of firepower as well as its 'flexible' design. The lack of photon torpedoes on the PIH was another reason why the design was a failure.
These ships were not as deadly as the infamous B'rel-class, which was tasked with replacing the Suspicious-class frigates. (ST video game: Klingon Academy)