HI I have gone through your mail and as you said that your child is having an extra tongue at the back of throat on saying ahhhhhh,he has severe cough.He had already fever
and rashes on abdomen few days back,on analysing your symptoms I am suspecting that your child is suffering from pharyngitis
.As for as your observation for extra tongue is concern,I am suspecting that you are seeing either tip of epiglottis
or lymphoid tissue of base of tongue (Lingual Tonsil
),this confussion may be clear by clinical examination by your E.N.T.doctor.Thanks.