'Wickedness' signifies evil, and 'iniquity' signifies falsities.

(Odkazy: Apocalypse Explained 741)

703. 16:14 For they are spirits of demons. This symbolically means that the lusts were lusts to falsify truths and to reason on the basis of falsities.

That demons symbolize lusts to falsify truths may be seen in no. 458 above. And because they were like frogs, the lusts were also lusts to reason on the basis of falsities, as said just above in no. 702.