I am pretty sure licking them doesn't work and is just regular misinformation. They also don't have to be killed, you just squeeze the venom out of the gland and let it dry. It contains bufotenin and 5-meo-dmt (Bufo Alvarius does at least) which are both hallucinogens that can be smoked for effect. If you were to take it orally you must combine it with an MAOI inhibitor.