You will be able to track them by their scent, I expect, for they exude an odor most unpleasant. Though you should take care not to remove them with bare hands, lest you come in contact with their poisonous coating…

[Although not quite as potent as the breath of the adult specimen, it is nevertheless an unpleasant experience.]

Fortunately, the pods only house one seed each, and the seedlings are not too difficult to deal with.