They could be salivary glands or small cysts.
Hi XXXXXXX welcome to XXXXXXX
You will develop swellings under tongue when you have infection in your oral cavity or over tongue. They could be salivary glands or small cysts. Deep seated infections of the neck can also result in swellings in that regions but they will be large and painful
As you did not mention pain, i believe you need not worry about them.
you may try Metrogyl
tablets twice a day for 5 days and watch for the response.
if they wont subside, you can contact a ENT surgeon.
Hope i am clear.
If you have any doubt, feel free to ask.