"Frak" and "frell" are not real words and, even if you're using them in the context of something as preternaturally lame as an Ain't It Cool News talkback, you sound like a gigantic lisping pile of dork whenever they come out of you. If you want to swear, go nuts - you're writing on a website where the owner somehow managed to compare Blade 2 to cunnilingus, after all, I don't think people are going to get offended because you felt like dropping a fuck-bomb. Swearing may be childish, immature and a good indicator of poor intellect, but using pretend swears SciFi Network Originals writers came up with to avoid censors while still cheaply manufacturing drama is a damned sight worse.
To put it in perspective, you're about one step removed from swearing in Klingon. And we can all agree that that's totally and soul-crushingly weak sauce.