My papaya seeds are fresh frozen.
I froze them spread out in a single seed layer, flat, in a ziploc freezer back. Stored flat, one bag on top of the other.
This way it is easy to get out just what is needed from a bag. They are not clumped.
I used about 3 tablespoons of fresh frozen, one very ripe banana, and fresh cultured buttermilk for each small smoothie.