Final answer:
The heart of a frog is located in the thoracic cavity, between the lungs. It consists of two atria and one ventricle.
Step-by-step explanation:
The heart of a frog is located in the thoracic cavity, towards the front of the body. It lies between the two lungs, slightly to the left side. The heart consists of three chambers - two atria and one ventricle. The atria receive blood from the body and lungs, while the ventricle pumps blood out to the body and lungs.