I agree with Kurt completely. Here are a couple links to two excellent books on keeping Horned Frogs. Both of these authors I highly experienced in the field, I found both of them extremely helpful, basic as they may be.

Amazon.com: Horned Frog Family and the African Bullfrogs, The (Reptile Keepers Guide) (9780764111273): Richard Bartlett, Patricia Bartlett: Books

Amazon.com: Horned Frogs: Plus Budgett's Frogs (Herpetocultural Library) (9781882770885): Philippe De Vosjoli: Books