Yep it's Gleditsia tricanthos aka honey locust. The seeds don't germinate unless they've been through something's digestive tract. Deer spread them by eating the pods. Thorns are a PITA since they will pop tires. Also they will go right through the sole of a tennis shoe. I'd much rather step on a nail and get a tetanus shot. Honey locust thorns HURT. It's like they have some sort of toxin or something in them.