The weapon is not flagged as "NPCs use ammo". FROST let's NPCs use ammo by addinng that flag to all ranged weapons.
Your mod also has several Identical To Master records, you should remove them with xEdit.
The leveled lists in which the weapons are injected to are not ideal, you might want to adjust the script injection. Otherwise the weapon might be too rare or too common.
You also should add Frost.esp as a master to the esp, so that they player is forced to load the plugin after Frost.
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(And if you want another weapon added to Frost i can try to make a patch for it if the creator of the weapon gives me permission)
Your mod also has several Identical To Master records, you should remove them with xEdit.
The leveled lists in which the weapons are injected to are not ideal, you might want to adjust the script injection. Otherwise the weapon might be too rare or too common.
You also should add Frost.esp as a master to the esp, so that they player is forced to load the plugin after Frost.
And ill try to not make the same rookie mistakes :P