Cross reference
Exodus 8:2
2 If you refuse to let them go, behold, I will plague all your borders with frogs:
Exodus 7:14
14 Yahweh said to Moses, "Pharaoh's heart is stubborn. He refuses to let the people go.
Exodus 9:2
2 For if you refuse to let them go, and hold them still,
Psalms 78:45
45 He sent among them swarms of flies, which devoured them; And frogs, which destroyed them.
Psalms 105:30
30 Their land swarmed with frogs, Even in the chambers of their kings.
Revelation 16:13-14
13 I saw coming out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, something like frogs;
14 for they are spirits of demons, performing signs; which go forth to the kings of the whole inhabited earth, to gather them together for the war of that great day of God, the Almighty.