Mmmmmm! I've considered getting the trachea from BestBullySticks but I'm not sure how long it would last so I'm also interested if anyone else has tried those. And I can't do any treats that look like animal parts (pig snouts are a definite NO lol)!
I was at a local pet store and they had a canister of salmon skin rolls which I thought would be a nice omega-3 rich treat for Toki but they smelled horrendous and I just couldn't do it! Bully sticks are about as stinky as I can stand
There are certainly a lot of interesting chew options like dried heart chunks and lung puffs though!