Recently, in another thread, I pointed out that Finns are not Indo-Europeans. What exactly they are can be found in the Budé edition of Herodotus.
4.106. ἀνδροφάγοι δὲ ἀγριώτατα πάντων ἀνθρώπων ἔχουσι ἤθεα, οὔτε δίκην νομίζοντες οὔτε νόμῳ οὐδενὶ χρεώμενοι: νομάδες δὲ εἰσι, ἐσθῆτά τε φορέουσι τῇ Σκυθικῇ ὁμοίην, γλῶσσαν δὲ ἰδίην, ἀνδροφαγέουσι δὲ μοῦνοι τούτων.
In a footnote the editor Legrand notes that according to 4.18, the ἀνδροφάγοι are an ἔθνος ἴδιον καὶ οὐδαμῶς Σκυθικόν and notes “on a supposé que ce pouvait être une population de race finnoise”, “it has been supposed that this might be a population of Finnish stock”.
I’ve got to digest this for a while, along with the rather heavy dinner I just had…