There is no real quick and human way to kill a toad or any animal in that matter without having access to the green dream. But if you put holes in a ice-cream container and the lid place the toad or toads in this then place that in the fridge for a couple of hours this puts the said toad/toads to sleep then you take said container and place that in the freezer. If you put the cane toad or another animals in the freezer they get icicle build up on their lungs and die a slow painful death. Yes cane toads and some other animals like field mice/water rats are pests in places but are they worth getting an animal cruelty charge over. Clubbing, detol, bangers, car tyres have been ways of quick kills we feel for many years I am sure many people are guilty of doing at least one of these things to cane toads at some stage of their lives but I don't see that it would turn them into murders etc.