Yes, that's a potato. The prompt from the book said to make a stamp from a sponge or potato. I was only vaguely aware of the technique of carving potatoes into stamps, but it turns out, this is "a thing." There are Youtube tutorials and everything! It's a popular activity for parents to do with their children. "What not?" I said so I got a potato from the pantry and got to work after breakfast. However, I forgot to carve the letters backward so it would print correctly, but I decided the stamp itself was more interesting than the print would have been anyway.
LOVE SOMEBODY! Hug a farmer today. Without them, we wouldn't have potatoes and other produce. For extra credit, shop at your local farmers' market and support local businesses.