This question already has an answer here:
If FOO is mentor to BAR, what term describes BAR's end of that relationship — specifically as “a person to whom FOO is mentor”?
- FOO is employer to BAR,
- ⇒ BAR is employee to FOO.
What is the equivalent term for the recipient of a mentor relationship?
Terms already considered
Some people, recognising a need for a term, use “mentee”. I'm pretty sure that is incorrect – there is no “ment” verb, so a mentor is not “one who ments another” and a “mentee” is not “one who is mented by another”.
So if that's your answer I'd like some strong support for its normal use more than any other.
A mentor is not the same role as a teacher. To describe BAR as a pupil of FOO would incorrectly imply that FOO is a teacher. So this term doesn't meet the required meaning.
As later discovered, the question is already answered on this site. The correct term is “protégé”.