My school mascot is Dons.
Can I say "Miss all Dons." or how to express that I miss all my teachers?
Some schools have nicknames for pupils or former pupils, but I'm not sure how many do for teachers, or how common it is for a mascot name to be used in such a way. Without specific knowledge of your school and its conventions, I think there is no way to know whether the name of the mascot can appropriately be used to refer to its teachers. If in doubt, it probably can't, would be my guess.
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Some schools have nicknames for pupils or former pupils, but I'm not sure how many do for teachers, or how common it is for a mascot name to be used in such a way. Without specific knowledge of your school and its conventions, I think there is no way to know whether the name of the mascot can appropriately be used to refer to its teachers. If in doubt, it probably can't, would be my guess.