Frogs used a peculiar form of psychological manipulation to make its actors appear genuinely frightened by the reptiles and insects surrounding them. Producer Peter Thomas reportedly kept the performers in the dark about the exact fate of their characters, rather than explaining in advance which animal would kill each person. That meant actors could not fully rehearse or emotionally pre-plan the film's succession of grotesque deaths: snakes, tarantulas, geckos, toxic greenhouse fumes, leeches, alligators, a water moccasin, and an alligator snapping turtle each claim victims in turn. The approach was intended to preserve spontaneous reactions in a production already using a large number of live animals. It also created an unusual contrast on set. Director George McCowan was described as supportive and reassuring toward the cast, while the production's deliberate secrecy depended on withholding information from the very performers expected to sell the horror. The strategy produced the startled expressions and frantic behavior the filmmakers wanted, though it also belongs to an era when genre productions routinely accepted far looser boundaries between acting technique, practical danger, and behind-the-scenes deception than a modern film set generally would.
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