Sore throat and tongue on one side. Normal MRI and CT scans. Could it be wisdom teeth or something else?

Is it a wisdom teeth. Sore throat and tongue is usually associated with wisdom teeth infection. You should visit an oral surgeon who specializes in wisdom teeth care for definitive diagnosis.
Could be. But you'll need to be seen by a local oral surgeon to know for sure. Please call for an appointment.
It could be. .. You could be suffering from Pericoronitis. Without Seeing xrays or in person I cannot say definitively, but it definitely could be wisdom tooth associated. Go to your dentist.