I think it might be Cronk, but I'm not entirely sure….
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Captain Slag (or his head).
I think it sounds more Slag-gish 
Ah, Siwel was first. Dang!
Yep, Siwel's right. Captain Slag.
Ok, my turn:
Your horns are stupid.
Ratchet talking to Tachyon in ToD? 
I don't know. This is a kind of Mr. Zurkon quote, but I don't remember any horny horned enemy that he'd fight.
You're right Filipuntik, it's Mr. Zurkon, altough it's one of the quotes he says when a Fongoid is close.
OK, here we go:
It's the green one's sidekick!
One of the Fongoids about Ratchet. I wonder how pissed off was he when he heard that 
Yesh
Let's go home and finish season five of "Trick out my dropship".
The only other quote I could think of was even harder than this.
Qwark? I suck at this game
It's Ratchet at the end of his story in Playstation All-Stars Battle Royale.