You might want to go to allaboutfrogs.org Form there I would go to frequently asked questions about pet frogs. There you will find a list of many different kinds of frogs. Is you frog completely aquatic, or do you know? Did you kech it or buy it. It sounds like you caught it to me. Since most frogs eat crickets I would try those first. You could also take your frog to your local pet shop, they might be able to identify it, and give you care instructions there. I hope this helped. I think you might get more replys if you post in a different forum. There is one on here for reptiles and amphibiens.
Oh thanks for that. I brought from my pet shop for £2.50 and they said its called a Brown frog. I am returning my female betta as its fighting with my male one so I will ask them there