Thanks for asking.
It can be ranula.
A ranula is a type of mucocele found on the floor of the mouth. Ranulas present as a swelling of connective tissue
consisting of collected mucin from a ruptured salivary gland
duct, which is usually caused by local trauma. If they are small and not problematic, then they are left alone, but otherwise minor oral surgery
may be required (usually removal of the sublingual gland
Hope it helps.