"Potrzebuję nowej łyżki."

Translation: I need a new spoon.

[ingmar65536]

Whiskey

[Walkinthedog]

Isn't a singular spoon a lyzka or can it be used both ways

[Jellei]

One spoon is "łyżka". "potrzebować" takes Genitive, and the Genitive singular form is "łyżki".

Yes, just like plural Nominative and Accusative.

[Walkinthedog]

I need new spoons was rejected,lyzka is singular lyzki is plural, correct? Both words were in English but spoons plural was rejected.

[Jellei]

Cases. In most cases, Genitive singular (what we have here) is identical to Nominative plural.

As you have the verb "potrzebować", which takes Genitive, you know that there is a singular spoon, because otherwise it would be "Potrzebuję nowych łyżek".