Froðu
Froðu is a term that can refer to several things, depending on the context. In Icelandic, "froða" directly translates to foam or froth. This is its most common and literal meaning. It can describe the foam produced by a boiling liquid, the lather of soap, or the effervescence of a carbonated beverage.
Beyond its literal translation, "froða" can also be used metaphorically. It might describe something insubstantial, empty,
In a more specific, though less common, usage, "froðu" can sometimes be encountered in certain regional dialects
The understanding of "froðu" is therefore heavily reliant on the surrounding words and the overall situation