My guess is that you are talking about a pitchfork.
hay
It is called a bail of hay. ANswer Hay bale.
When you cut grass in the meadow, this is called mowing the grass and if the grass is to be used for hay it is called mowing the hay or a 'hay mow'.
It is called a bale of hay.
The unit for hay is usually a bale, which is called a 'bale of hay'. It is just a block of hay.
1q2w3e
The hay knife is a hand tool while a scythe is usually pulled by horses or machinery
Because they used to wash hay in the river
There is no such thing. Hay is hay regardless if it's a part of a hay pile, part of a hay bale, or anything like that.
the support for a stack of hay
it is what a horses hay supply is called (bales of hay)
1q2w3e