It's how a frog "croaks" or makes it mating call.
The bladder stores urine.
The storage of water so in dry periods a frog will still has a watersource. The bladder is also used as a defence mechanism; if a frog is handled the frog will spill his urine to distract the predator.\ The bladder is also use to filter urine
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 urinary bladder stores the urine in the frog.
near the back
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 frog's urinary bladder is located in the lowest part of the body cavity.
urinary bladder
I think it is to protect the baby frog
B/t the lobes of liver is a rounded pouch gall bladder is located
Um you could be a little more specific: color, size according to other organs, and position inside the frog. But still, I'm going to guess your either talking about the gall bladder or the urinary bladder. Here is what they look like and there purpose. Gall Bladder: It is the small green sack underneither the liver (looks like a booger... no joke). It's purpose is t store bile that is created by liver. The bile is secreted in small amounts and used to help digest food when a frog needs it. Urinary Bladder: If you look at the anatomy of a frog it would be the lowest organ in the frog. If disecting the frog it will be an empty sack. Its purpose is to store urine. I hope this helped! ^_^
The answer is the gall bladder.