I have Arilus cristatus (Wheel Bug)eggcase I'dd like to trade for other interesting insects. The eggcase is from my colony they are around 3rd gen. and have a good hatch rate.
3 1/2 to 4 inches sounds more like D.femorata. M.dentricus females are around 6 inches and males around 5 inches when adult but the food is the same. Good luck with your new pet
Try willow if it's still small also try apple,cherry,blackberry and raspberry leaves. You can try triming the ends off of the leaves this may help if it's small. Could be stress from captivity but should be ok in a couple of days. Megaphasma are hard to get started when young but do fine after...
The males have a strikingly pink carapace when adult and are slender with longer legs.They also have tibial spurs on their front legs
for mating. Females are stocky and not as brightly colored as adult males. I have a 8 year old female they are great pets.