Is there a verb for vendors shouting aloud in a market?
Like "one pound,one pound only".
And is there a noun for this kind of shouting? Peddling words?
Thank you in advance.

Question

Answer

I'd say barking or shouting.  Hawking is a very appropriate word but does not require that the person is shouting or being loud.

Answer

I think the phrase you're looking for is "hawking their wares."
See the fifth set of definitions: http://www.merriam-webster.com/dictionary/hawk

Answer

We Aussies have a lovely word for it: "to spruik".

A person who spruiks is a spruiker.

Answer

Look at this article on the "Arab'' vendors of Baltimore.  There are some great links in the article.
http://en.wikipedia.org/wiki/Arabber

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!