In French, you would say, "Puis-je avoir un gâteau, s'il vous plaît ?" This phrase translates directly to "Can I have a cake, please?" in English. It’s a polite way to request a cake in French-speaking contexts.
Gateau is food cake in french
A birthday cake in French is 'un gâteau d'anniversaire'
gâteau
A banana cake is "un gâteau à la banane" in French.
gâteau sucré
If you mean a slice of cake it is - tranche
acheter un gâteau
gâteau basque.
To say "I would like, please" in French, you can say "Je voudrais, s'il vous plaît."
Gateau à la fraise
Gateau(Le) gâteau
"un gâteau parfait"