It's unforunate, but yeah does make sense to take invasive toads and sell them in the pet trade as they don't belong where collected. However, because they are wild-caught you never know how well they'll adapt to captivity. Some may do extremely well and take advanatage of being pampered with food and others might become stressed and decline. I've seen most people have good results, with their toads gorging down food and even tolerating being handled and this makes me jelly, but I've also seen lots of people having no luck with them. Videos on youtube will show off toads doing well, but it doesn't make sense to show off toads that are not.

Smooth-sided toads can be captive bred I'm sure and basically look the same as cane toads, if not prettier, so would be a good idea to go with one of them. If you're fine with tree frogs, then most people will recommend you get a whites tree frog. They're said to be one of the few frogs that actually tolerates handling well and they can get quite large, but I've yet to get one myself, which I'm quite surprised at. The frog foam will be ideal for these since they don't need to burrow and because they're arboreal you'll save space, since the tank will taller than wide.