We always find it amazing what people do in their gardens, keep it clean at the back please. We found this when we were on out on our travels, me driving and the boss in the turret.
A toad, or perhaps a frog, in the hole. The hole is an old, glazed terracotta drainage pipe set high in a wall and forms a home for the plastic amphibian.
Perhaps he's waiting for the great flood so he can launch himself straight in.