Here are some ideas for getting rid of frogs. These are the "short versions" of the full explanations which can be found in my article on this subject at Karlonia.com. I have included a link to the relevant page under the "Related Links" section below.
1. Move the frogs to another location (catch and release method).
2. Eliminate favorable habitats for the frogs.
3. Turn off outdoor lights.
4. Kill all of the bugs that the frogs normally eat.
5. Bring in natural predators.
6. Use a citric acid solution.
7. Repel them with moth ball chemicals.
8. Spray them with bleach (not really humane, but somewhat effective).
9. Repel them with salt or vinegar solutions.
10. Spraying them with caffeine has been used as an effective repellent in some studies.