Ooh hissing cockroaches are neat! I haven't heard of ivory head but looking them up they seem pretty awesome. I don't think I've ever seen cockroaches that look like that. I haven't been super interested in raising them myself but my roommate actually happens to have a bunch of feeder roaches in the house for their bearded dragon haha, pretty sure they're dubia roaches.
Anyway, Happy New Year to you too! Hope you're doing well!