"Cowabunga" would make a great warp phrase
Found here: https://www.startrek.com/news/set-phasers-for-strange-9-of-the-most-unexpected-star-trek-collectables
ha, only one has ears
Donatello, lay in a course for Rigel II. Warp 5. Cowabunga.
Makes sense having Michaelangelo as the cursed chief engineer if you consider "The Last Ronin" storyline. Splinter and his brothers are murdered, so Mikey uses all their weapons/styles to seek vengeance.
Spoiler tag would be welcome here. I understand that Last Ronin keeps the identity of the remaining turtle under wraps for awhile.
Edit: But that would have been my guess, anyway.
When the ninja turtles become the crew of a federation star ship.