Yesterday we found a frog swimming about in our water butt. The butt was only a quarter full and we thought maybe he was stuck in there?. With 2 empty flower pots got him out and let him go into the cool overgrown bank. Theres no ponds around here.. dont know where they might be living.
Anywhere it's a bit damp, with lots of vegetation. They like long grass and the like; if you've got any really overgrown neglected plots around they're probably in there.