What is the fleshy, muscular organ attached to the floor of the buccal cavity known as? 

The tongue is a fleshy, muscular organ attached to the back of the oral cavity. 

The buccal cavity floor, also known as the oral cavity, is the space inside the mouth where food is chewed, tasted, and processed before swallowing. 

The tongue is a vital organ that performs numerous functions such as speech, swallowing, tasting, and chewing. 

The frenulum, a thin piece of tissue that holds the tongue in place, anchors it to the floor of the mouth.