Although I have never personally seen chicken feet, I know that two of Tomie De Paola's books for children mention them. One is
Watch Out for the Chicken Feet in Your Soup and the other is in
Tom. Tomie De Paola writes wonderful books for children with many of them based on his family, in particular his Irish and Italian grandparents.
Check out
www.tomie.com for a great children's author who knows about chicken feet.