The first sniffet for the twin is the one you get in the back of Rusty Valley shop (in the bedroom on a barrel) during the day
The second sniffet for Giant Loyd is in Whiterain 2nd area (where you mine for ores) on a tree during the evening
I'm missing only the 3rd one for the twins and i'm pretty sure i've seen it already but I forgot about it ...
Edit : found the very last sniffet missing for me, the 3rd for the twins is on the fence at the training camp during the afternoon