The British Royal Navy built the first boat to launch self-propelled torpedoes in 1877. They followed up with new designs right up till WW1 and on. The Italian Navy also built many early torpedo boats and used them to great effect in WW1.
Lake Torpedo Boat ended in 1924.
Lake Torpedo Boat was created in 1912.
Greek torpedo boat Pergamos was created in 1919.
Greek torpedo boat Kyzikos was created in 1920.
Ottoman torpedo boat Sultanhisar ended in 1928.
Ottoman torpedo boat Sultanhisar was created in 1907.
Greek torpedo boat Proussa was created in 1919.
Greek torpedo boat Kydoniai was created in 1920.
Greek torpedo boat Panormos was created in 1919.
No, a U-boat is a submarine. A torpedo boat is the boat that destroys the submarine.
Greek torpedo boat Panormos ended in 1928-03.
Greek torpedo boat Kios ended on 1941-04-22.