Ridgeline like bumps running perpendicular to frenulum underneath tongue on both sides of mouth and one movable hard bump on floor of mouth underneath tongue. are they blocked salivary ducts? what could cause them? they are painless, just concerning.

Bumps: Could be minor salary glands. Hard lump could be stone in submandibular gland duct. Should have this checked by ENT as small salivary gland tumors can occur in floor of mouth

Anatomy: Much of what you describe sounds like it is probably normal anatomy. I say probably because you need to be examined to be sure. Only concern is hard moveable lump. Please see your Dentist to make sure.