Noun phrase.
/kabeθa de ˈplatanos/
"Cabeza de plátanos" literally translates to "head of bananas" in English. In Spanish, this term refers to a bunch or a cluster of bananas, typically used when referring to a group of bananas still attached to each other.
This phrase is more commonly used in oral speech rather than in written context.
Me gusta comprar una cabeza de plátanos en el mercado.
Translation: I like to buy a bunch of bananas at the market.
Por favor, trae una cabeza de plátanos para la ensalada.
Translation: Please bring a bunch of bananas for the salad.
There are no specific idiomatic expressions associated with "cabeza de plátanos."