Answer:
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
Weight in my belly, trees on my back, nails in my ribs, feet I do lack. What am I?
I have three feet but I cannot walk. What am I?
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
What gets sharper the more you use it?
I flow from the Homerβs mouth when he sees doughnuts.