Q. I am considering researching the questioning technique of "cold calling" students. What key words should I use to search for relevant articles?

I would need more information.  There are articles in ERIC:

http://library.plymouth.edu/r/http://search.ebscohost.com.libproxy.plymouth.edu/login.aspx?direct=true&db=eric&bquery=%26quot%3bCold+calls%26quot%3b+OR+%26quot%3bcold+calling%26quot%3b+OR+%26quot%3bcold+call%26quot%3b&type=1&site=ehost-live

but it dorsn't look like it's a question that has received much attention.

Are you cold calling to recruit student?  To get them to participate?  What age level are you dealing with?