The frogs are back - spring must be here

This photo comes from Pondcam, which is a CCTV camera with infrared illumination.  As a photo, it's terrible, but it does show 2 frogs near the bottom, and some eyes and dark shapes near the top edge of the pond. There's also vegetation in the pond, adding complexity to the image.  I took a couple of proper cameras outside, but the frogs all disappeared under water.