Find The Frog!

A biologist is searching for a rare frog in a remote region of Brilliantia. The local villagers claim a single frog lives in a series of four ponds.

They claim that the frog stays in a pond during the day, and moves to a neighboring pond every night. The biologist can only check one pond a day, and she does not impact the frog's movement at night.

Can the biologist devise a strategy that guarantees she eventually discovers the frog?

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