we were given a gift and then without our knowledge was taken back and sold, can I sue in small claims to get it back?

You can sue the people who sold the cart for the damages  you suffered rom their conversion (theft), i.e. the value of the cart, but have no claim to recover the cart from the purchasers unless the purchasers knew, or had reason to know, that the cart did not belong to the sellers.  Absent such knowledge, the purchasers are what is known as "bona fide purchasers for value", against whom you would not have a valid claim.