While you could just stack this deck full of powerful Dimir Creatures like Wrexial, the Risen Deep, a zombie theme is much more fitting as it will help get cards in your graveyard and ensures there will be synergy with whatever creature you choose to copy
And while Junk tokens are great, Junk tokens and some repeatable card draw is way better
Due to the vast variety of playstyles that Frogs have access to, there are plenty of Frog cards in the game to support each one
Marcy: A 6/6 for 6 that gives you some energy, and then gives you a chance to blow something up, if you have the energy to spend
Like all sideboarding, hating Dredge (and any linear deck for that matter) must be done so within the context of a specific plan and your specific deck
Now you might be asking something along the lines of, Roman, why do you care? For those of you who dont know, I have a background in film sound design