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.