Thank you for the information .Those are unlikely to be thyroid tissue.Thyroid gland lies further down.Ectopic or abnormal position of thyroid would be detected by scan.As there was no mention of any such abnormal thing, I feel you can watch it or get it checked by doctor.
Doctor can palpate it physically & suggest its nature.
I hope this information helps.I will be happy to assist, if you need any clarification.Please feel free for any follow up query. Best wishes.
Then you need to get it checked by doctor.