This is a paid asset, but now you can download Realistic Clay Shader for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Realistic Clay Shader v1.3.0
With this shader for Unity you can give a clay like to your models and also create a cool stop-motion effect.
It’s built using Shader Graph and it’s compatible with Unity 2019.2+ and both HDRP (High Definition Render Pipeline) and URP (Universal Render Pipeline formerly known as Lightweight Render Pipeline).
IMPORTANT: The built-in render pipeline is NOT supported. You must use High Definition Render Pipeline or Universal Render Pipeline.
The shader is highly customizable allowing to make more or less visible the fingerprints and flat areas over the material. It also alows to move the marks around to mimic the effect in stop motion movies where it looks that fingerprites change their position in every frame.