Parashas Vaeira · Passuk 8:2
Chabad.org — English translation + Rashi
Torah Temimah points to Sanhedrin 67b (verified).
Sefaria — Exodus 8:2
Sefaria — Sanhedrin 67b
E-Daf — Sanhedrin 67b
English: The verse uses the singular “the frog.” Rabbi Elazar explains that there was initially one frog, which spawned and filled Egypt with frogs. Rabbi Elazar ben Azarya offers a different reading: the single frog called to the others, and they came.
On the daf / in context: See the cited source for the full section.
Derash from the singular form הַצְּפַרְדֵּעַ, with competing tannaitic explanations of how the plague multiplied.
The singular wording is treated as significant: Chazal discuss whether one frog multiplied throughout Egypt or whether one frog summoned the others. The derasha therefore reads the grammatical form of the passuk as part of the narrative detail.