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near the back
The frog's urinary bladder is located in the lowest part of the body cavity.
B/t the lobes of liver is a rounded pouch gall bladder is located
Frogs do have bladders, but I don't think there is such a thing as a "small bladder" in a frog. I suspect that the asker may be referring to the "gall bladder". If so, please see the related link below which shows a frog's gall bladder, below its liver.
the organ that is underneath the liver in a frog is the gall bladder
The bladder stores urine.
A couple of organs are located underneath the liver of a frog including the lungs, fat bodies, gull bladder, stomach, intestines, and depending on the gender, the eggs.
It is similar to the function of the gall bladder of a human. They both are used to store the bile, a digestive juice, that is created by the liver. When needed for digestion, the gall bladder secretes a small amount to aid in the breaking down of the food (specifically the emulsification of fats).
The urinary bladder stores the urine in the frog.
It's how a frog "croaks" or makes it mating call.
urinary bladder
I think it is to protect the baby frog