This is the 9071st most frequent Catalan word.
foca
Seal (marine animal).
The word 'foca' here refers to an animal, specifically a seal, used as a subject of the sentence.
La foca viu en el gel de l'Àrtic.
The seal lives on the ice of the Arctic.
In this context, 'foca' is used metaphorically to describe someone's appearance when they are heavily dressed.
El nen estava tan abrigat que semblava una foca.
The boy was so bundled up that he looked like a seal.
'Foques' here is the plural form of 'foca' and is used to describe the animal in a general sense.