As adverbs the difference between frequently and commonly is that frequently is at frequent intervals while commonly is as a rule, frequently, usually.
Frost is much mentally weaker than Frieza. Frost uses poison, Frieza would find that beneath him. Frieza has a much stronger sense of self, much more willpower etc.
horikoshi is NOT queerbaiting kiribaku, they are not canon. no ship is canon in this series. this is a SHONEN manga, romance is the least important aspect of it. if you come to bnha automatically assuming that a certain ship is canon, then step out.