Prepare pie crust: Place almonds in the bowl of a food processor and process into an almond meal that still has some chunks; do not overprocess. Add dates and pulse until combined with almond meal. Pour water in, 1 tablespoon at a time, with the processor running, until dough sticks together. Mix in cocoa powder and salt.
Spread almond crust mixture evenly in the bottom of a 10-inch springform cake pan. Place in the freezer while you prepare filling.
Combine bananas, cocoa powder, cardamom, and salt in the food processor bowl; mix until combined and thick.
Pour filling on top of the pie crust and sprinkle with chocolate chips. Return to the freezer for at least 2 hours or overnight before slicing and serving.