These are often vehicle and clothing packs for players roleplaying as wildlife officers.
If you are looking for roleplay content involving the Minecraft Warden mob, there are several "Expansion" and "RP" files specifically for the Bedrock Edition. Warden RP v2 Download!
You can find the ruleset on Ghost Spark's Itch.io page . 2. Minecraft "Warden" Roleplay Add-ons These are often vehicle and clothing packs for