Yeah, Scrounge was Blaster's sidekick on Cybertron in the Marvel run...although I always felt like his face design was the least Transformers-like approach they could have taken. It was almost as if the editors told the artist: "Make a Transformer that doesn't fit at all into the aesthetic we've used so far...make it look like some kind of modern art sculpture...I dunno, just stick a pyramid on its neck and plop two eyes on it. It doesn't have to be that good; he's dead in a few panels anyway."
As for the Lithones...I always liked them. I think it was from reading the long descriptions in the TF Universe comics that Marvel sold, so I felt like I was in on some kind of obscure secret when watching the movie.