joukkujen
Joukkujen is a form found in Finnish that represents the genitive plural of a noun joukku, a word that is not part of standard, contemporary Finnish. In everyday language, the common words for “group” or “team” are joukko, ryhmä, and joukkue, whose genitive plurals are joukkojen, ryhmien, and joukkuieden or joukkueiden, respectively. Joukkujen appears mainly in dialectal, regional, or historical texts to mean “of the groups” or “belonging to the groups.”
The precise status and etymology of joukku as a base are uncertain in modern linguistic references. It
Usage and examples are typically encountered in archival material, regional speech writings, or hypothetical linguistic discussions
In contemporary Finnish writing intended for broad audiences, speakers generally use the standard genitive plurals joukkojen