Raise netting up on rocks or sticks so that the frog can get into the pond under it. Stapling the net to broom handles and placing these on bricks might do the trick. Or if your pond is too large for this, use a net held up by Gro Thru frame head legs - normally used to keep plants upright. You can find these in garden centres. Fiddle around till you have fixed the net on the top of the head, rather than letting it slip all the way down. .