Hello,
Thanks for posting your query at DoctorSpring.com
These are circumvallate papillae, which are normal taste buds all of us have on posterior 1/3 of tongue.
I have attached pictures of normal anatomy. So nothing to worry.
Hope this helps
Best regards
Dr. Sunil Jalan
MBBS, DLO,MS(CMC,VELLORE)DNB(ENT),DAA,MBA(HM)