Take him to a vet. It may require surgery. This is the reason why most frogs should not be kept on rocks or gravel. If not taken to a vet, he will most likely either pass them out or will become impacted and die. Good luck and let us now how it turns out.
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Andy Maddox
AIM: thekingofproduct
MSN: Poloboy32486@hotmail.com
Yahoo:surfandskimtx04
Houston Herp Key
The Reptizone