According to the novelization of Star Trek II: The Wrath of Khan, one of the science team members on Regula I was a Deltan....but I didn't see any baldies in the movie version.
I wouldn't take that too seriously - it was one of a number of attempts (despite the omission of "II" from the book title) to make the story an ostensible sequel to
TMP, despite the absence of such things in the movie of
TWoK. Moreover, Spock's coffin is seen to burn up entering the atmosphere at the end of the
TWoK novel, making Spock unalterably dead, so the whole thing takes place in a different universe as far as I'm concerned. (I never did read the novelization of
TSFS to see how they resolved that aspect.)