The second plague is announced with an almost comic precision. Frogs will not merely swarm; they will specify. Targum Pseudo-Jonathan on Exodus 7:28 lists the destinations: into thy house, and into the bedchamber where thou sleepest, and upon thy couch; and into the house of thy servants, and among thy people, and into the ovens, and into thy baking-troughs.
The meturgeman wants you to feel it. Pharaoh pulls back the royal blanket — a frog. The baker opens the oven — a frog leaps out of the flame. The servant lifts the dough from the trough — frogs in the flour. Nothing in Egypt is private anymore. Nothing is clean. The palace is indistinguishable from a swamp, and the royal bakeries are unusable.
Why frogs? Because Egypt's gods included a frog-headed goddess, Heqet, patroness of fertility and birth. The God of Israel is not only crashing Egypt's kitchen; He is turning Egypt's sacred symbol into a household pest. The being Egypt thought protected childbirth is now hopping across the royal pillow.
The takeaway: when an empire worships the wrong things, those very things rise up against it. The second plague is not random; it is Egypt's theology collapsing through Pharaoh's bedroom window, one wet landing at a time.