Freezma For Fabric
Freezma is made for Fabric; it requires the Fabric Loader & Fabric API.
https://www.curseforge.com/minecraft/mc-mods/cloth-config
Information
Freezma is a simple mod that makes snowball slow down mobs and players (if specified in config)
Config File
In order to give you a better experience and the ability to customize some parameters to your liking, it's necessary to install: ClothConfig and it's also marked as dependency, so you need to install it.
Duration (in miliseconds), and other things can be easily tweaked in (.minecraft/config/freezma.json).
Source code
https://github.com/DanikingMC/Freezma