Exodus 8:3

3. bedchamber ... bed--mats strewed on the floor as well as more sumptuous divans of the rich. ovens--holes made in the ground and the sides of which are plastered with mortar. kneading-troughs--Those used in Egypt were bowls of wicker or rush work. What must have been the state of the people when they could find no means of escape from the cold, damp touch and unsightly presence of the frogs, as they alighted on every article and vessel of food!

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Verse 3 The river shall bring forth frogs abundantly - The river Nile, which was an object of their adoration, was here one of the instruments of their punishment. The expression, bring forth abundantly, not only shows the vast numbers of those animals, which should now infest the land, but it seems also to imply that all the spawn or ova of those animals which were already in the river and marshes, should be brought miraculously to a state of perfection. We may suppose that the animals were already in an embryo existence, but multitudes of them would not have come to a state of perfection had it not been for this miraculous interference. This supposition will appear the more natural when it is considered that the Nile was remarkable for breeding frogs, and such other animals as are principally engendered in such marshy places as must be left in the vicinity of the Nile after its annual inundations. Into thine ovens - In various parts of the east, instead of what we call ovens they dig a hole in the ground, in which they insert a kind of earthen pot, which having sufficiently heated, they stick their cakes to the inside, and when baked remove them and supply their places with others, and so on. To find such places full of frogs when they came to heat them, in order to make their bread, must be both disgusting and distressing in the extreme.

Adam Clarke, 1831 · public domain