Psalms 78:45 ESV
He sent among them swarms of flies, which devoured them, and frogs, which destroyed them
The above text says the flies devoured them and the frogs destroyed but in the original narrative we are only told of them causing discomfiture rather than death(devouring)
It was only the last plaque which caused the death of the first born which caused Pharaoh to capitulate
Exodus 12:29 ESV
29 At midnight the Lord struck down all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the dungeon, and all the firstborn of the livestock..
Why does the Psalmist say they were devoured and destroyed by flies and frogs respectively?