We don't have synonyms for aformentioned yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are aforementioned, forementioned and formentioned.
"The PA system broadcast a long list of names in the morning, but it wasn't until later that they requested the aforementioned students report to the health clinic."
"The PA system broadcast a long list of names in the morning, but it wasn't until later that they requested the aforementioned students report to the health clinic."