Matt,
I would imagine at this time of year, and in these conditions, that the frog was hibernating. The heron has probably come across it while rooting about in the silt at the bottom of the pond or in the leaf litter nearby. Loosing the odd fish is part of the price of having a pond that attracts wildlife to your garden. In my opinion one of the main reasons for having a garden pond.
Goldfish seem particularly vulnerable, mine vanish within days. But I have kept orfe, roach, golden rudd and tench for a few years now. Still lose the odd one though.
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