Finding out who is disguised

[Brottweiler]

We are facing an issue where a lot of people are disguised as various mobs and there's no way for OPs to find out who is disguised. We can teleport to players to confirm but that is tedious.

Is there, or could there be, a clever way of finding out who is disguised? Maybe a list of all disguised players and what they're disguised as, or even better a way to confirm which user is the specific disguised mob that I am currently looking at?