It will work if and only if frob() is a method call. In other words, if you call Pileoffrogs::Frob::frob(), it will not work using the method you describe. But if you call Pileoffrogs::Frob->frob(), it will. If you want Pileoffrogs::Frob::frob() to work, you'll need to add this to Pileoffrogs::Frob::Util:

use Exporter;
our @EXPORT_OK = qw(frob);
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and change the use base line in Pileoffrogs::Frob:

use base Pileoffrogs::Util (frob);
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Hope that helps..