Use the audio blaster to lure them into a 'march of death' towards a haemeroid cream dispenser (or a local Chinese Toad exporter), which then tips them into a conveyor belt-fed 'freezer of doom'.
Once solid they can be catapulted (or mangoneled or trebucheted I guess) into the sea (or sold to the Chinese).
Meanwhile the catfood brigade can be cleaning up the small-fry, though I guess someone (or maybe two people?) would need a sort of 'toad-vac' to suck up the carcasses for delivery to the local furnace/Chinese exporters.
I wonder how long before there is a national 'Toad-bash' day? oh too late (see http://parkhowell.com/green-advertising-and-marketing/nothing-like-a-good-poisonous-toad-bash-to-celebrate-earth-hour) they are doing that already.
Oh those upside-down scamps!