I think one of the attractions kids and teens have with the Teenage Mutant Ninja Turtles (TMNT) is that the name itself is quirky and sounds fun. Those particular words mashed together are sort of an absurdity. An adjective followed by three unlikely juxtaposed nouns -- it's just weird. But is it grammatically correct? I've always thought it to be, until last night when I happened to hear it, and it didn't sound right.
Extended noun phrases are uncommon in English. As I understand it, they are common in Finnish and German (and probably other languages as well). They even remove the spaces between the words of the phrase. In English, though, it sounds, well, "off".
I understand the fun-factor is in itself a marketing tool. Around 1990 a TMNT movie came out. To take advantage of the brand awareness, a commercial bakery began mass-producing Teenage Mutant Ninja Turtles Cookies. They came in a bag like Oreos. If that's okay, how far can you take it? Can one speak of the Teenage Mutant Ninja Turtles Cookies bag? And the bag has a label -- TMNT Cookies bag label??
This is a current topic. I could not find a page talking about the prepackaged, ready-to-eat TMNT cookies already discussed. But I did find this: Betty Crocker Teenage Mutant Ninja Turtles Shell-Shocked Sugar Cookie Mix. (I think I'll buy and make it, and save the BCTMNTSSSCM box. 😍 ) Let's see -- 8 nouns, 1 adjective, and one compound adjective. They are taking the "fun name" concept to a whole new level. But again, can that be correct?