The Norwegian name for long-tailed silverfish is "skjeggkre", which translates to "beard critter".
The Norwegian name for Spanish slug is "mordersnegle" or "brunsnegle", which translates to "murder snail" and "brown snail". There isn't really a word for "slug" in Norwegian except for "nakensnegle" (naked snail), so I guess that's why we call them snails.