thing that connects tongue to bottom of mouth
Frenulum of tongue The frenulum of tongue or tongue web (also lingual frenulum or frenulum linguÃ¦; also fraenulum[1]) is a small fold of mucous membrane extending from the floor of the mouth to the midline of the underside of the tongue.
Philtrum The philtrum (Latin: philtrum, Greek: φίλτρον philtron, lit. "love charm"[2]), or medial cleft, is a vertical indentation in the middle area of the upper lip, common to many mammals, extending in humans from the nasal septum to the tubercle of the upper lip. Together with a glandular rhinarium and slit-like nostrils, it is believed[by whom?] to constitute the primitive condition for at least therian mammals. Monotremes lack a philtrum, though this could be due to the specialised, beak-like jaws in living species.[3]