"A little bird told you" IS a sentence.
A Little Bird Told Me was created in 1947.
A Little Bird Told Me - 1934 was released on: USA: 7 September 1934
It means that you are not going to tell that person who told you something. You usually hear this phrase when someone finds out something that was supposed to be a secret - they will say "A little bird told me that ____" and tell the secret.
The little Bird will perch on a window sill
Horrid Henry is most likely scared of you. A little bird told me.
Evelyn Knight - A Little Bird Told Me
The bird's beautiful trill could be heard throughout the forest.
"A Little Bird Told Me" Sung by Evelyn Knight
If you are a bird, I'm a bird.
No.
Little Bird
yes 'told' is the verb, or action in this sentence.