Would German torpedo boats have been useful at the Battle of the Denmark Strait?
Short answerYes, especially the small-destroyer types, but deploying them over the required distance would be the difficult part.
NotesGerman vessels officially called torpedo boats must be distinguished from very small coastal craft. Many were effectively small destroyers and could have contributed to the battle if extended-range examples reached the area. Their presence would add escorts and torpedo threats around Bismarck and Prinz Eugen. Endurance and deployment to the Denmark Strait are the main obstacles, showing how a tactically useful ship may still be strategically unavailable.