Hello and welcome to FF! Sorry about the injured frog. You can use one of these vet locators: Herp Vet Connection and Arav . How is frog doing? If you can't take to veterinary, the only thing could do is to care for the frog and hope it somewhat recovers from it's ordeal. If you can post pics it will help determine the extent of damage. Also, how long is frog from snout to vent (SVL)?
Most important thing right now is to keep it in a clean environment and feed it a nourishing diet. Crickets should be sized same as distance between frogs eyes and gut loaded with carrots, lettuce, oats and cherios. Night crawlers are very nutritious and can be purchased from Walmart or a bait shop, just ensure they are free of chemicals like dyes. Large frogs can eat them whole; but for smaller ones, can cut sections from pointy end same as frog's length.
It's is specially important to offer CA/D3 and vitamin supplements to help bone repair. Can see some information and schedules in here: http://www.frogforum.net/food-feeder...schedules.html .
Finally, here is a nice article for it's care: Frog Forum - Leopard Frog Care - Rana pipiens (Schreber, 1782) and R. sphenocephala (1886) . Thanks for helping frog and good luck!