Where does “frothen” come from?

frothen (Cornish) comes from Middle English frooth, from Proto-Brythonic fruɨθ, from Latin frūctus, from Ancient Greek δῶρον, from Proto-Hellenic dṓron, from Proto-Indo-European déh₃rom, from Proto-Indo-European deh₃- — to give.

Ancestry of “frothen”, step by step

StepLanguageWordMeaning
1Middle Englishfrooth—
2Proto-Brythonicfruɨθfruit
3Latinfrūctusenjoyed; having derived pleasure from
4Ancient Greekδῶρονgift; hand's width
5Proto-Hellenicdṓrongift
6Proto-Indo-Europeandéh₃romgift
7Proto-Indo-Europeandeh₃-to give
Every word from Proto-Indo-European deh₃- →Every word from Proto-Indo-European déh₃rom →Every word from Proto-Hellenic dṓron →