Hognose venom is low in 3ftx (3 finger toxins) and rich in proteins. Most colubrid venoms (and elapid venoms) are the opposite. Hognose venom is medically insignificant.
Swelling, a little bit of pain and itching. The longer you let them chew, the worse it can be.
Technically, they are venomous. In reality, they are harmless.
Remember - technically a bearded dragon is also venomous.........