Is hydrogenated soybean oil a trans fat?

Depends HOW Done. The vast majority of c-c bonds in all fats are single, aka saturated (no room for more hydrogen side atoms). If double bonds (unsaturated) present & converted to single bonds by industrial hydrogenation lacking control: ½ cis, ½ trans. All living cells do cis-. See google images. Plant fats more double bonds & liquid, than animal, more solid, but this does not mean healthier: ancel keys fraudulent.
Probably. Just read the label. By law, the nutrition facts box on the package must list trans fats.

Related Questions

What are some foods that don't contain hydrogenated soybean oil or trans fat?

Many. Just read the label. By law, the nutrition facts box on the package must list trans fats.
All Animal Fats. Vast majority of c-c bonds in all fats, plant & animal, are single, aka saturated (no room for more hydrogen side atoms). If double bonds (unsaturated) present & converted to single bonds by industrial hydrogenation lacking control: ½ cis, ½ trans. All living cells do cis-. See google images. Trans fats only from hydrogenated vegetable oils to make more solid. Be aware ancel keys was fraudulent.