I haven't heard of a 'frieze' function so far. Also searching the HELP or the forum doesn't return any hits.
Could you provide the context you have seen this function?
Regarding the wildmatch() function, it's explained in the help (and there are lots of threads in the forum with detailed explanations):
The wildmatch function performs a case insensitive comparison and permits the use of wildcard characters ( * and ?) in the comparison strings.
wildmatch( M, 'ja*','fe?','mar')
returns 1 if M = January
returns 2 if M = fex
There is Freeze in Qlikview.
just like if you want your expression could not effect by month then it means freeze month.
There is no function called "frieze" exists in Qlikview.
Did you mistype the spelling of any other function !!