It is not recommended to feed croissants to cats. Croissants are baked goods that are high in carbohydrates, fats, and sugars, which can lead to weight gain, digestive issues, and other health problems in cats. Additionally, croissants may contain ingredients that are harmful to cats, such as chocolate or raisins, which can be toxic to them. Therefore, it's best to avoid feeding croissants or any other human junk food to cats and stick to a balanced and nutritionally complete cat food recommended by a veterinarian. If you want to provide your cat with a treat, it's best to choose a healthy and cat-friendly snack, such as a small piece of plain cooked meat or a small amount of cooked vegetables, after consulting with a veterinarian.