Preheat oven to 400 degrees F.
In a large saucepan, combine cherries, granulated sugar, cornstarch, cinnamon, salt, and lemon juice. Stir to fully coat the cherries, then heat on medium heat until cherries are thawed and mixture is thickened. Stir frequently to keep mixture from sticking to the bottom of the saucepan.
Once the cherries have thickened, set aside to cool slightly.
Roll out one pie dough sheet to a 10 inch circle then transfer the dough to your 8-inch pie dish. there will be overhang and that's okay.
Pour your cherry filling into the pie dish and spread evenly.
Roll out your second pie dough sheet to a 10 inch circle and cut out two holes for eyes, two slits for the skull nose, and a crooked smile.
Gently roll the dough sheet over your pie dish, making sure the skull face is in the center. Press the edges down, slightly sealing the bottom and top crust edges.
Use a fork to fully seal the edges then brush the pie with an egg wash (1 egg + 1 tbsp milk) and sprinkle with Demerara sugar.
Bake on the middle rack for 45-50 minutes. Pie should be golden brown.