Kilahdukset

Could you clarify what Kilahdukset refers to? I want to make sure I write an accurate, neutral wiki-style article. Is Kilahdukset a real Finnish term for a concept, a medical condition, a place, or something from fiction? If you can share its meaning or a source, I’ll draft a concise, under-300-word article. If you’d prefer a fictional encyclopedia entry, I can create a clearly labeled version as well.