Answer
Yes, Pluto was the sole dwarf planet discovered by Clyde Tombaugh. Tombaugh is best known for his discovery of Pluto in 1930, which was initially classified as the ninth planet. However, with the reclassification of celestial bodies and the introduction of the "dwarf planet" category in 2006, Pluto was reclassified as a dwarf planet due to its size and orbital characteristics.