Why is gallbladder positioned so closely to the liver in frog?

The reason as why gallbladder is being positioned close to the liver is because gallbladder stores the bile being produce in the liver. The bile being secreted in the liver and there are bile salts aiding in the digestion as well as the absorption of fats and this then will be stored temporarily in the gallbladder.

The Gallblader stores the bile produced by the liver.
 The gallbladder is positioned close to the liver in frogs  because it serves as a store of the bile being produced in the liver.The role of the bile is to aid in the breakdown of fats.

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