During my deprived (not really!) childhood we where submitted to greasy margarine rather than lovely butter, it being considered 'healthier' at the time - hence I used to end this rhyme not -

Life is butter dream

but

Life is margarine

My wife dose about five versions of this with my daughter involving different animals and sorts of water course, including the crocodile/stream/scream one above. The only one I can remember now involves a Polar Bear, a river and not forgetting to shiver (BRRRRRR!!)

Sorry - done of that was to do with the original post!