The perks in COD Mobile extend the gaming experience by enabling a particular feature in your Gameplay. Cold Blooded lies in the Green Perk category that disables the effect of the enemy's AI-controlled scorestreak on you.
When the Cold Blooded is equipped in your Loadout, the AI-controlled scorestreak of the enemies will not affect you. AI-controlled means that the game is automatically doing the scorestreak function, where a human's presence is not involved. Shock RC, Sentry Gun, and Stealth Chopper are examples of AI Controlled Scorestreak. The VTOL, XS1 Goliath, and Cluster Strike are examples of Manual Controlled Scorestreak in COD Mobile.
These AI Controlled scorestreaks will not affect you in COD Mobile if you're using the Cold Blooded green perk in the loadout:
Shock RC.
Hunter Killer Drone.
These Manual Controlled scorestreaks will affect you in cod mobile if you're using the Cold Blooded green perk in the loadout:
Shield Turret.
Guardian.
Predator Missile.
Lightning Strike.
Cluster Strike.
Orbital Laser.
Napalm.
XS1 Goliath.
Chopper Gunner.
Gunship.
According to my experience, you should use Cold Blooded Perk in these Maps:
Firing Range.
Crash.
Shoot House.
Standoff.
Dome.
Raid.
Summit.
Nuketown.
You can use the loadout where Cold Blooded is equipped in those maps where you feel that the enemies are using Shock RC, Hunter Killer Drone, Sentry Gun, Stealth Chopper, and Swarm scorestreak.
Every perk offers a different feature, so there is no alternative of the Perks. However, if you're not interested in using Cold Blooded Perk in Cod mobile, then here are some other green perks which you can use:
It makes the enemy footprints visible for 6 seconds, which helps you to track where the enemies are going.
The enemy's EMP Grenade and Trip Mines don't affect you. Also, your mini-map will remain visible even if the enemy activates Counter-UAV Scorestreak.
It allows you to hack your opponent's Trophy System, Trip Mines, SAM Turret, Sentry Turret, Transform Shield, and Munitions Box. However, you need to manually perform the hack.