Line a 7-inch springform pan with parchment paper.
Pulse coconut and almond flour in a food processor until fine.
Add 1/4 cup soaked cashews, 2 tbsp maple syrup, 2 tbsp coconut oil, and salt. Process to combine.
Press the crust mixture firmly into the pan and set aside.
Blend remaining cashews, remaining maple syrup, coconut oil, vanilla, lemon juice until smooth.
Pour half the filling over the crust and smooth.
Blend remaining filling with mango, then pour over first layer.
Blend blackberries separately and swirl into the top layer.
Freeze for 4-6 hours or until firm.
Let sit at room temperature for 10 minutes before slicing.