Is there an oral electronic thermometer with a loud beep for paople hard of hearing.?

I haven't seen one, but may I suggest an ear thermometer? They are fairly inexpensive, usually take only a few seconds to get a reading, and the difficulty with hearing the beep needn't be a concern. You may wish to ask your physician if there is any reason that the cause of the hearing loss might affect the effectiveness of the ear thermometer since it works by reading the heat from the eardrum, if the anatomy is altered he may suggest another option.