But why? Secret from who? Is there some ring of frog thieves at work? Are frogs considered a national security issue? What I'm questioning is this posture of secrecy as a default without any apparent reason for it.

Today, I'd blame influencers that would like to go there to take a photo or piss on the frogs and upload the videos to social media. (And a few persons that want a exotig pet frog too.)