A Frog in Her Throat

Reesi has a little cough. This morning when she woke up this is what I heard between her and her child(stuffed animal), Carla.

Carla: Mommy, do you have a frog in your throat?

Reesi: "No, don't worry. People can't get frogs in their throat."

Reesi has obviously heard this phrase somewhere, but doesn't quite understand it yet.