According to their website, Skippy brand peanut butter does not contain trans fat.
Strictly speaking, according to their website, Skippy brand peanut butter contains a negligible amount of trans fat. Per the US FDA,
The Nutrition Facts Label can state 0 g of trans fat if the food product contains less than 0.5 g of trans fat per serving. Thus, if a product contains partially hydrogenated oils, then it might contain small amounts of trans fat even if the label says 0 g of trans fat.
So they're being sneaky, right? Not really. The amount of trans fat in a serving of peanut butter is far less than the limit of 0.5 grams that needs to be reported as above zero. Only a tiny amount of hydrogenated vegetable oil is added to peanut butter to make it smooth, prevent separation, and drastically increase shelf life, and only a small amount of that small amount is in the form of trans fat. While non-zero, the amount is essentially undetectable. From Sanders, T.H., 2001. Non-detectable levels of trans-fatty acids in peanut butter. Journal of agricultural and food chemistry, 49(5), pp.2349-2351,
The fatty acid composition of 11 brands of peanut butter and paste freshly prepared from roasted peanuts was analyzed with emphasis on isomeric trans-fatty acids. No trans-fatty acids were detected in any of the samples in an analytical system with a detection threshold of 0.01% of the sample weight. Hydrogenated vegetable oils are added to peanut butters at levels of 1--2% to prevent oil separation. Some hydrogenated vegetable oils are known to be sources of trans-fatty acids in the human diet. The addition of these products was not found to result in measurable amounts of trans-fatty acids in the peanut butters analyzed.