This is the 12370th most frequent Polish word.
mrożone
"Frozen."
In this example, 'mrożone' serves as an adjective to denote 'posiłki' (meals) that are prepared and preserved by freezing.
Lubię mrożone posiłki, bo są wygodne.
I like frozen meals because they are convenient.
Here, 'mrożone' is used as an adjective describing 'warzywa' (vegetables) as having been preserved through freezing.
Czy w sklepie były mrożone warzywa?
Were there frozen vegetables in the store?
In this sentence, 'mrożone' acts as an adjective describing the condition of the 'owoce' (fruits) as being frozen.