Searching the internet I found that the "mulkvisti" Finnish post is a troll joke. Mulkvisti is rarely used insult word similar to "dickhead" or perhaps "prick."
For real pet names for the lover they use words as rakas (dear), kulta (gold) and muru (similar to honey, lit. meaning a tiny fragment or a crumble).
For real pet names for the lover they use words as rakas (dear), kulta (gold) and muru (similar to honey, lit. meaning a tiny fragment or a crumble).