I suppose that is possible bc I did purchase them at TSC so they could have been inaccurately labeled. I saw the leghorn bin but didn't purchase one knowingly.
The chick could be a White Leghorn or a White Rock (full name, White Plymouth Rock). Both of those have white feathers, yellow feet, and single combs. When they grow up, Leghorns have white earlobes and lay white eggs. Rocks have red earlobes and lay brown eggs.
Cornish Cross meat chickens would also be white with yellow feet and a single comb, but I do not think you have a Cornish Cross. They have a different body shape and grow so quickly that I think it would be obvious by now if you did have one.