The spelling of the plural form of the noun “scarf” is scarves or scarfs.
The standard spelling for the item of clothing you wear around your neck is scarves, but “scarfs” is also an acceptable alternative.
Scarfs is the standard spelling for technical uses of the word (e.g., to mean a part of a wooden joint).
You can use QuillBot’s free Grammar Checker to help you pick up errors in the spelling of nouns with confusing plural forms such as “scarf.”