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Weeeeeeeellll, the thumb is a digit, and finger can either mean one of the five digits or one of the four digits with three phalanges. So the thumb can not be a finger if you really, really want it not to be.
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Don't you just adore the internet's unhealthy fascination with semantics?
Although I would like to point out that the 2009 Collins Dictionary and Thesaurus (Australian Edition) cites "thumb" as a synonym for "finger".