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A) Yes. Ducks have this nasty habit of sometimes dropping eggs wherever the mood strikes them. Especially some of the laying breeds, whose maternal instincts seem to have been bred right out of them. Wherever you confine them at night, provide some sort of nesting enclosure with a few egg surrogates (pronounced: "golf balls") inside to encourage the ducks to lay in the nest box. Also, try letting them out later in the morning, as ducks like to do their laying very early in the morning. A question: Are they being confined in some sort of shelter at night? Or has the pond become their shelter?
B) No, don't eat pond eggs. The natural protective coating that forms on them in a dry nest doesn't form in the bottom of a pond, eggshells are porous, and duck ponds aren't known for their hygienic qualities.
C) No, don't incubate pond eggs. For pretty much the same reasons you shouldn't eat pond eggs.