Money that you get from an employer is never a gift. Any money you get from your employer, including cash-value gift cards, is additional taxable wages and should be included in the wages in box 1 of your W-2. What you need to ask your employer is whether they included the value of the cards in your W-2. They probably did, since that's the correct way to handle it. If they did include it in your W-2, you don't have to do anything special. Just enter the W-2 in TurboTax.
If they did not include the cards in your W-2, post back here and I will give you instructions for how to enter the additional income in TurboTax so that it is treated as wages.
