Not anymore, unless you count the ‘waiting for their turn in the incinerator’ pile a stockpile. Most of them have heavy internal corrosion which makes them difficult to use or to destroy without killing people down wind.
Well, the plan was to drop it if Japan didn’t surrender first. We certainly wouldn’t have dropped it after they surrendered, that would have looked really bad. I’m at a loss for what sort of plan you think we should have had. More leaflets that they didn’t read? No, we didn’t really expect them to surrender because they had spent years immersed in anti-surrender propaganda and their civilians had at times (Okinawa iirc) thrown themselves off of cliffs en masse rather than surrender. So no, we weren’t planning on winning that easily. Yes, we wanted to know the relative effectiveness of the bomb types because we were planning on making more and dropping them during the invasion.
