Mollusks are alive and have one foot.
A man missing a foot A Clam!
is big foot alive
One square foot is 1 foot X1 foot, 1 foot square is also 1 foot x 1 foot. The only difference is that in 100 square feet it would be 10 x 10 or 5 x 20 etc but in a 100 foot square it is 100 feet X 1 foot only.
Chucky is a doll that comes alive a night, and kills people. He is only a foot tall.
14 inches is longer than 1 foot because 1 foot has only 12 inches.