Process the pumpkin seeds and oats into a meal. Remove and set aside.
Add the dates to the food processor and process until they resemble a paste.
Add back the pumpkin seed mix along with the cocoa powder, coconut oil, vanilla extract, and sea salt. Process until well combined, adding the water a little at a time to create a dough.
Form the dough into eight cookie-shaped disks. It's helpful to moisten your hands with water for this step.
Put the disks on a plate covered with waxed paper and set in the freezer while making the filling.
FOR THE ICE CREAM:
Process the avocado, coconut oil, maple syrup, vanilla extract, lemon juice, and salt until smooth.
Divide the ice cream between four of the eight cookies.
Top with the remaining four cookies and press them together lightly, making sure not to squeeze the filling out.
Freeze the sandwiches until filling is fairly solid to the touch.