We have had frogspawn in our pond now for a few weeks. Unfortunately, like last year, most of it seems to be over a large stone we have at the edge of the pond that we put there to assist frogs or animals to get out of the pond, a sudden drop in temperature resulted in the eggs freezing. we have tried to push it further into the pond so more is covered by water, but we too have found it too sticky and welded to the stone to be moved.