For example, if you add an encounter with 2 zombies onto the Combat Tracker, one might be named "Stumbling Zombie", and the other might be named "Decomposing Zombie".

It tries to use a creature-specific table (you can create one if the one you want isn't included), or change the existing ones as desired.

1. If first checks for a table called "Flavorful {Creature} Names" (e.g. Flavorful Zombie Names),
2. then if that's not found, it checks more general names (like Giant instead of Hill Giant),
3. then if that's not found, it checks using the type (at least for 5E) "Flavorful {Type} Names" (e.g Flavorful Undead Names),
4. then as a last resort it will use the very generic "Flavorful Names" table.

If a table isn't found, it outputs a message indicating you can create it (once per table per session, it doesn't spam it).

I think this extension serves the same purpose as Tideturner's NPC Flavors so you may want to check that one out.  My main intent with this one was to make the names fit the creatures, and to let you modify them to fit your campaign.

This package includes a module (for the tables), and an extension (to apply the labels).

Make sure you load the module, and select extension when loading your campaign.  The option to enable it is on by default, but can be toggled.

NOTE: You must set the "Combat NPC Numbering" option to Random (it's not that by default).