Any way to change the tick rate of an entity?

Basically no, technically sorta kinda but it sounds like a nightmare.

At least afaik. @Connecticut Warbler might correct me here?

But I doubt you can desync entity tickrate from server tickrate without fuckery that could only be called severe.

plants yes, entites not

spawn rates yes

for all pratical reasons: no. you can technically do it but thats a streach