energy is stored by tightening the flexor muscles against the extensors. this is called the catapault mechinism. it is also used by human sprinters as they place tension against the starting block.
In body fat.
liver
The spleen stores blood in the frog. It is an organ found within the mesentery. This is part of the frogs circulatory system.
Toads have a developed Bidder's organ, frogs have a degenerated organ wich will not be functional.
Fat cells.
Frogs have a crop and a gizzard. A frog also has a organ called a polci.
The gallbladder.
Intestines are present underneath frogs stomach i.e on the posterior side of the body.
All organisms store energy. The only possible exception would be the virus, and it is debatable whether viruses should even be regarded as organisms.
The bladder. It stores urine.
I know that weed killer Deforms The sex organs in frogs, but I'm not sure what produces it.
Gall Bladder
I think it's the liver