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@jubiloMX Yeah, thumbs are just thick stumpy fingers that are attached to the wrist instead of the end of the hand. So they're a different kind if finger.
So we've got two types of fingers: Thumbs, which have a special name to differentiate them from the regular type, and regular fingers (which don't have a special name).

Although now I think about it, I suppose TECHNICALLY we should really say that fingers and thumbs are different separate things, and they are both a type of digit (in which case, we have 10 digits, of which 8 are fingers and 2 are thumbs), but in practice, in actual daily use of English, we don't do that.