A word for counting the prisoners
The term you are seeking is roll call, which applies to any process in which a list of names is checked against the people present.
Headcount or head count:
- The act of counting people in a particular group. (AHD)
Head count reveals prisoner's escape:
- Robert John Dwight, 33, was found to be missing during a head count by prison officers at Silverwater jail about 9.00pm AEST yesterday.
(www.abc.net.au/news)