Hello & welcome,
If you have no pain in the bumps, that means those are not really harmful or they are not associated with certain infection.
Bumps on the area behind the lower anteriors may be so called torus mandibularis which is abnormal growth of mandibular bone lingualy and their presence is absolutely harmless .
This growth can be seen most likely in the premolar area of the mandible. If it is bigger in size than usual, it may interfere with the function of the tongue or patient may feel discomfort due to it.
No treatment is necessary as such. Only you can do is to visit your dentist
& get clinically examined to rule out any other problem related to floor of the mouth below tongue.
Normally salivary gland
ducts & their openings can also feel like bumps if they are slightly bigger in size, but this condition is very rare & patient may not even notice it.
Don't ever try to push them or or put pressure on them as there are chances of getting hurt & it may then get infected later on.
Just keep your oral cavity clean by proper brushing techniques & even by use of antiseptic mouthwash occasionally.