Yes, men were famous for wearing pigtails throughout the history. For instance, Chinese boys and men used to wear braided pigtails in the 17th century as a sign of dignity and manhood.
However, if a man has a wide face, pigtails will only accentuate its roundness. In this case a pulled back pony or a manbun is better. Pigtails look more flattering, if a man has narrow face. Moreover, wearing pigtails in front of ears can hide large ears.