Most of airlines don't accept frozen ATPL as ATPL pilot.
Basically, Frozen ATPL pilot is pilot who don't have enough flight time for ATPL (1500 hours)
But some country are allow them to exam paper test. After they have enough flight time, they will got ATPL.
Most airline that require ATPL pilot don't accept frozen ATPL.
remark: Thai DCA don't have frozen ATPL.