Did Japan build an equivalent to American PT boats, British motor launches, or German Schnellboote?
Short answerJapan had coastal craft with torpedoes and several kinds of gun armament. Whether these formed a directly comparable dedicated fast-attack force is uncertain, with infrastructure identified as a constraint.
NotesJapanese coastal patrol craft carried varied combinations of torpedoes, naval guns, automatic cannon and machine guns. These vessels could fill roles similar to those of foreign small attack craft. Whether they amounted to a comparable dedicated motor-torpedo-boat or motor-gunboat force remains uncertain. Infrastructure limited what Japan could field, although the craft available could still be used effectively.