We always recommend you put "use strict;" at the start of each program

If you had done so, and added "my" to each variable, the compiler would have told you:

Variable "$rolldie" is not imported at test-dice.pl line 9.
Variable "%tally" is not imported at test-dice.pl line 18.
Variable "%tally" is not imported at test-dice.pl line 19.
Global symbol "$rolldie" requires explicit package name at test-dice.p
+l line 9.
Global symbol "%tally" requires explicit package name at test-dice.pl 
+line 18.
Global symbol "%tally" requires explicit package name at test-dice.pl 
+l
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All of which you would need to fix, in order to get your program to work.