It's just idea I got from remember something I saw Tsuyu Asui do in a episode of My Hero Academia, but now I decided that it's not necessary for Toadians to have such an ability. also I work on better way for Toadian's Poison generation to work. which is this Toadian's have poison glands located inside a special muscle that looks like diaphragm found in humans. when they expend this muscle after the glands inside it collect poison than expels a poisonous gas which causes their bodies to bloat like a balloon.
to release this poison gas all they have to do is exhale.