Why frogs? This plague was more than just an annoyance; it was a profound statement about who is truly in charge.
This second plague, like the first, serves as a powerful demonstration of Jehovah's absolute sovereignty over creation and over the gods of Egypt. The Egyptians worshiped many deities associated with fertility and the natural world, including frog-headed goddesses. By commanding frogs to swarm the land, God wasn't just punishing Pharaoh; He was publicly humiliating Egypt's gods and revealing their utter impotence.
Calvin points out that God 'shows that the Egyptians had hitherto held their lives by a precarious tenure.' This means that even before this plague, their existence was only preserved by God's restraint. The frogs were always there, held back by His hand. This plague, and indeed all of Egypt's suffering, is a direct consequence of Pharaoh's stubborn disobedience. It underscores that God is not merely a distant deity, but an active, intervening God who holds rulers and nations accountable.