Tuff is a new block added in Minecraft 1.17. It isn't very useful, except that it is a good building block to go with stone or andesite. Tuff is found in small patches (normally two patches per chunk) between Y=0 and Y=16. Hope you like this design!
Credits: I got the textures from the Pixel Papercraft Block Generator:
1. Click on the papercraft design image.
2. Make sure it has not been resized by your browser (you might need to click the image again).
3. Print using your browser's Print function.