What does 呼ばれてる mean in this context? I’m reading a story, and in it 2 students are talking about a teacher. One says, This is followed by a scene where the boys were caught with a prön mag, and the teacher telling them they have to be more careful about it. She later confronts him about it saying, I have no clue how to interpret this usage of as I’m certain it can’t mean “call” as that wouldn’t make sense.

I think this in fact something that the boys have been calling this teacher (presumably behind his back), as a kind of pun on his name, {}. (They are deliberately mispronouncing the first character as instead of .)

Edited to add: The above answer was premised on the assumption that you understood the grammar but thought must have some meaning other than "call" because you couldn't understand why the boys would be calling the teacher such an odd thing. Since Chocolate has suggested in a comment that it might be the use of the passive voice that's throwing you off, I'll just add that doesn't mean "call," but "is being called."