TMNT - Teenage Mutant Ninja Turtles Ukuleles. Based on the hit film and series we have a selection of ukuleles decorated with the Teenage Mutant Ninja Turtles characters. They are popular with 'Ninja Turtle' fans and are very colourful with cheeky Turtle faces. As a musical instrument the TMNT ukuleles play well for an entry-level instrument. Ideal for younger ukulele fans.