And they gathered them together upon heaps: and the land stank.
God chose contemptible frogs to strike down a haughty king, magnifying His power over all creation and humbling Pharaoh's pride. What a mortification for a monarch to be forced to his knees by creatures a child can master, yet whose numbers made all his chariots and horsemen helpless.
AI summary
Commenting on Exodus 8:1-15
But when Pharaoh saw that there was respite,.... From his affliction, as the Targum of Jonathan adds; the plague was removed, and he found himself and his people at ease: or there was a "breathing" (c); before he and his people were so oppressed, that they could scarce breathe, but now being delivered from the judgment on them with which they were straitened, were enlarged...
They gathered them together upon heaps - The killing of the frogs was a mitigation of the punishment; but the leaving them to rot in the land was a continual proof that such a plague had taken place, and that the displeasure of the Lord still continued.