No. Sheep’s lungs are on the list of things that cannot be imported into the US as a result of the bovine spongiform encephalitis scares and the USDA has said that even if the ban were lifted, apparently FSIS has ruled that lungs aren’t food and it still wouldn’t be allowed.
I had a haggis once from a food truck in the park on some kind of “International Day”. It looked and tasted exactly like a really bland bratwurst.
Is this something like raw milk, where if you know a sheep farmer you can make the transaction, drug deal style, with cash, in person? Or is it completely, 100% illegal?
Yes, they remove all the internal organs, as a general rule. You typically get legs of lamb, bone-in; shoulders, ditto; loins; cutlets; chops; and steaks / ground meat. You can ask for heart, kidneys, and/or liver. They don’t sell lungs, stomach, etc.
In that case my friend you only have one recourse. You’re going to have to get your hands dirty and delve into the murky depths of the so-called “tartan net”.
Be careful though, deal with the wrong chookter and you’ll likely end up with something cut with prime rib – nasty stuff.