Also any fruit places that serve fresh Durian or Durian Ice Cream? (This request is probably impossible - but what the hell...)
You can definitely find fresh durian in Chinatown or in some Asian grocery stores in other parts of town.
If you go out to the opposite corner of town from where your base is (the sunset district), there’s a gelato place on Taraval Street called Marco Polo that has all kinds of tropical fruit gelato, including pretty good durian gelato.
No idea about Taiwanese pig blood cake, but you might be able to find something similar in Chinatown, which is largely Cantonese (your link mentions that pig/duck blood cake is from Fujian, so I suspect those also existed in Guangdong).