Answer:
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
When you take away the whole from me, there is always some left. What am I?
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
I go up, let out a load and then go back down. What am I?
Long and slinky like a trout, never sings till it's guts come out.