Sforno on Exodus 8:7/ספורנו על שמות ח׳:ז׳

1וסרו הצפרדעים, G’d will not only remove the ones which have already bothered you, but He will ensure that they will not again afflict you.

2ממך ומבתיך, but not from the whole country; on the contrary, they will die in the land and cause a stench, but in the future they will not leave their habitat in or near the river.