Mang-da is the large bug we use for its flavour. Nam Prik is chilli paste used to add spice and interest to food. I've mentioned this Mang-da Nam Prik before, usually made these days with fake mang-da flavour.
But not this one!
As you can see from the bugs on top this is the genuine article, very cheap too, he has a wide selection of Nam Prik flavours 3 pots for 50 baht. Catch him at Bangnarmphueng Floating Market during the weekends.
You can see his stall above. I really like the authentic Thai weekend/floating markets, so much more fun than the tourist ones selling Chinese plastic trinkets!