Forked tongue
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A forked tongue is a tongue split into two distinct ends at the tip. This is a feature common to many species of reptiles. Reptiles smell using the tip of their tongue, and a forked tongue allows them to tell which direction a smell is coming from.
The image has given rise to the expression "to speak with a forked tongue," meaning: to say one thing and mean another or, in more general terms, to act in a duplicitous manner. It was used as if it was a Native American saying in early western films with the (often hostile and evil) Indians uttering phrases like "White man speak with forked tongue".
See also
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