At distal end of mandibular arch pear shaped structure which is composed of typical gingival tissue known as?
Retromoplar papilla:

It is an scar/remnants of gingival tissue of last mandibular molar extraction

Retromolar Pad:

Triangular pad of soft tissue at distal end of lower ridge.
Retromolar pad
Retromolar papilla
Pterygomandibular raphe
Masseteric notch