Originally posted by Nerevar:

gjalls can have stars. but only during nighttime spawns. not during day. so they are very rare. but they exist up to 2 star.

lox dont spawn with stars cause they tend to spawn in groups of 3 as 1 spawnpack. and 3 2 star lox in 1 spot would be a bit silly.

Exactly, i'm not necessarily the biggest fan of starred loxes. If you found a 2 star lox then it's just better to tame it instead of bothering to kill it.