Funnily enough, Google translate does translate "toe" to "dedo del pie" and "finger" to "dedo".

Which makes me wonder what the same captcha would say in French. In French, "doigt", while technically for both toes and fingers, is usually unambiguously "finger", and "toes" is "doigts de pied".

So if the captcha would pull the same joke in French, telling to flag "doigts", I, as a French, would only pick fingers and not toes at all.