Should be fine, at that range the flash will power down and the built in flash on most cameras is pretty weak to begin with. Unless you're going right up in the frogs face and firing off dozens of full-powered flashes in a row, I wouldn't worry about it.
I've flashed hundreds of wild frogs and my own frogs many times. I've never seen them react in any way at all to the flash. I've flashed frogs at night, in the day, while calling, while eating, and they'll just continue to do what they were doing provided I don't make any sudden movements that startle them. I do generally use a big honking diffuser on my main light which is much easier on the eyes of the subject, and to be fair I have also flashed myself at much higher power than I'd ever aim at a frog, just to see how I liked it.





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