Шмот 8:8 Комментарий: Rashi, Ibn Ezra, Sforno & Or HaChaim

ויצא. . ויצעק THEY WENT … AND CRIED [UNTO THE LORD) immediately that they should be destroyed by to-morrow.

Moshe left … and cried out. He trusted that Hashem would not allow him to be humiliated, for in fact it was his own choice to assert to Pharaoh, “As you say,” without approval from Hashem.

ויצעק משה אל ה' על דבר הצפרדעים אשר שם לפרעה, Moses prayed that G’d remove only the crocodiles which had been sent against Pharaoh and his people, whereas any others should remain in the river. It required a special prayer, here described as an outcry, to ask G’d how to arrange the removal of this plague.