Loofah and Doofah are two "Yellow-Bellies" (Beipiaosaurus) who first (and as of yet, only) appear in The Land Before Time XIII: The Wisdom of Friends. Loofah is voiced by Cuba Gooding, Jr. and Doofah is voiced by Sandra Oh.
Loofah is the cheerful leader of a herd of Yellow-Bellies who, in the film, are looking for Berry Valley. He is very friendly and optimistic. He has a good relationship with Littlefoot who teaches him some wisdoms to help him get to the valley. Doofah, who is his close friend, is a prominent female in his herd, and is equally friendly and optimistic, albeit not particularly intelligent. She likes to hum most of the time and seems to really like flowers. She seems to like Cera, calling her beautiful several times and hugging her twice. She's isn't able to recognize danger right away, for example her mistaking the sharpteeth for a mirage. Both of them have short term memory loss, and are motivated by impulsive needs.
Loofah and Doofah, particularly Doofah, have been met with very negative reception from both fans and detractors of The Land Before Time, with most criticisms stemming from their overly silly nature and lack of intellect.