What is a palette knife?
A palette knife is a type of knife with a flat, flexible blade that is used for spreading rather than cutting, primarily used in art (“e.g., “Spread the paint using a palette knife”).
“Palette knife” is also the British English term for “offset spatula” or “icing spatula.”
On a related note, QuillBot’s free Grammar Checker will help you to decide if palette, pallet, or palate is the word you need.