I just realized that yeah, Last Gamble would be the best skill to work with Des Frog. You can discard your copies of Tadpole, send Treeborn Frog with Skreech and use Enemy Controller and Storm to get rid of backrow and monsters on your opponent's field.
Send this to graveyard with Screech (you need 2 copies and no more to special summon 3 Des Frogs) and then use Enemy Controller or something to get the Des Frog on field in the following turn.
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