Am I, I am, crazy

Here's a llama, there's a llama, and another little llama, fuzzy llama, funny llama, llama, llama, duck.
Llama, llama, cheesecake, llama, tablet, brick, potato, llama.
Llama, llama, mushroom, llama, llama, llama, duck.
I was once a treehouse, I lived in a cake, but I never saw the way the orange slayed the rake.
I was only 3 years dead, but it told a tale, and now listen, little child, to the safety rail.
Did you ever see a llama kiss a llama on the llama?
Llama's llama tastes of llama, llama, llama, duck.
Half a llama, twice a llama, not a llama, farmer, llama.
Llama in a car, alarm a llama, llama, duck
Is that how it's told now? is this oh so old? is it made of lemon juice? doorknob, ankle, cold.
Now my song is getting thin, I've ran out of luck,
Time for me to retire now and become a duck...