There is no reason this would be happening other than either the skimmer is not being cleaned out properly or it needs to be replaced.
Don't understand how you have frogs in a salt water pool system. Frogs are fresh water animals. Frogs do not smell. If your skimmer is somehow fresh water and frogs are laying eggs to multiply, feel blessed as they are great bug eaters. Rid the frogs and suffer with bugs. Think of their sounds as music. I would love to have them. Please don't hurt them.
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