Well, we can agree to disagre again then
They are indeed organs but are considered a muscle meat.
Few quotes from the rawfeeding list from other users
"Tongue is considered a muscle meat like the heart, it's an organ but it's a
muscle."
"While the tongue is an organ, it is also muscle."
From Chris
"Like the heart and the gizzard, tongue is an organ that is also a
muscle. It's one of those body parts that can be used when looking to
feed a goodly amount of organ meats...but without really trying. Most
people think only of liver and kidney as feedable organs. Tain't true.
http://www.answers.com/topic/tongue
"The fleshy, movable, muscular organ, attached in most vertebrates to
the floor of the mouth, that is the principal organ of taste, an aid in
chewing and swallowing, and, in humans, an important organ of speech.
An analogous organ or part in invertebrate animals, as in certain
insects or mollusks."