@Coloma I can send you a bag. They’re ugly, disgusting and poisonous. They kill animals that eat them. Cats, dogs, venomous snakes, crocodiles… and they can squirt their poison if you annoy them sufficiently.
Tree frogs, I love them and even native toads would be fine. Not that I can recall ever seeing a native Australian toad. I’m sure we have them, I’m just not sure where they are or what they look like. Cane toads are imported pests and if I, or anyone else, could find a way to get rid of them, I think all Australians would rejoice.
Not sure if they eat spiders. Apart from stuffing toads and selling them as souvenirs, they have no useful purpose. I’ve certainly never heard of them having such a useful purpose as controlling the insect population. Plus we have sufficient lizards and the like to do that.