You can also look on beyond for Nezumi.
Ratfolk historically are a signifciant part of my campaign worlds. They are 'Pi-rats' made up of my Nezumi and Were-rats.
Mine have:
Size: Medium
Dex +2 / Chr +1
Darkvision
Climb speed of 20
Proficiency: Acrobatics, Perception
Expertise (double proficiency) on Perception involving smell
May hide as a bonus action
They can hold something in their tail, but not manipulate it.
Advantage on Survival checks to collect food.