Crossword Genius

What a frog will do in the end (5)

Ross

I believe the answer is:

croak

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But I can't explain it at all! Could you help me understand?

(Other definitions for croak that I've seen before include "Frog's sound - die" , "Caw" , "Make a froggy sound" , "Noise from pond life - die" , "Frog's call" .)

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