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Vine's Expository Dictionary of NT Words
is mentioned in Revelation 16:13 . Quacks were represented as "frogs" and were associated metaphorically with serpents.
These files are public domain.
Vines, W. E., M. A. Entry for 'Frog'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/f/frog.html. 1940.