A frog named Sir Frogbert

*gets scared*

Sir Frogbert, pride edition.

Look, I think the Basic™ answer is that frogs belong to the Transmutation school of magic because, hello, metamorphosis, but galaxy brain herpetologists know that more than a quarter of all frog species don't have tadpoles.

Toxicologists could tell you of the venomous species that can deliver a real Shocking Grasp that leaves you with Burning Hands—mainstays of Evocation magic.

Ecologists will tell you frogs are pivotal mesopredators and those with tadpoles occupy two trophic niches over their lifespans—classic Abjuration magic.

Some field biologists will tell you how hard it is to find some frogs, even when they are calling from immediately in front of you—archetypal Illusion shit.

Other field biologists might tell you that sometimes frogs start calling a few minutes before the rain actually comes. Obvious hallmark of Divination school.

Conservation biologists will tell you that some species that were declared Extinct or likely Extinct have been rediscovered recently, so I suspect at least some are from the Necromancy school

Behavioural ecologists might tell you that some frogs have familiar pet tarantulas (Big Spider want you to think it's the tarantulas keeping the frogs as pets, but don't be taken in by their biased lies). You want to tell me that they're not Conjuration wizards?