A frog in our garden?

Last night, as I was putting the rubbish in the bin, I saw something small jumping. I could not even see the shape clearly, but I could see the movement, if that makes sense, and it leapt like a frog would. I was still skeptical about it, but when I told my wife she said she thought she heard a frog this afternoon, although she did not see anything. If it is the case, I wonder how it got here, as there is no pond nearby and the nearest one is not so easy to access. It would have needed to travel quite a lot to end up in our garden.