Well, I know some people actually thought ferrets are rodents. Which seems odd to me, because ferrets hunt rabbits and stuff.
AAre there any rodents that actually do eat meat?
Rats.
Yes. There are a number of rodents that are largely insectivorous/carnivorous. One example is the Grasshopper Mouse, which sometimes even eats other mice.
Rats, mice, gerbils and hamsters all engage in cannibalism on occasion.
It also might be mentioned that there are a number of species of aquatic rats that feed mainly on fish, crabs, and other stream life.
I saw a group of white feeder mice drag half of a mouse corpse into the cute little house to eat it at a pet store.
Nothing makes my day like seeing a content mother mouse, chewing on her offspring. 
Moles are rodents. I think they eat earth worms.
Moles aren’t rodents, they are insectivores. Different lineage.
Not rodents, but they do eat other animals.
Shrews look a bit like mice, but like moles are Insectivores. They are highly predaceous, and will kill animals larger than they are themselves.
What technically qualifies as a rodent?
Lisa buys a hamster for a school science project:
Lisa: I want the most intelligent hamster you’ve got.
Clerk: OK. [reaches into a box of hamsters under the counter and randomly selects one] Uh, this little guy writes mysteries under the name of J. D. McGregor.
Lisa: How can a hamster write mysteries?
Clerk: Well, he gets the ending first, and works backward.
Lisa: Aw, C’mon.
Clerk: Look, kid, just take him before his mother eats him, all right?
Any member of the Order Rodentia. They have two gnawing incisors in the upper and lower jaws that grow continuously so they never wear out. It is the largest order of mammals, with over 2,000 species.
Rabbits are related, but belong to a different order. They have four incisors in the upper and lower jaws.
Well, “Rodent” just means a certain group of animals that share a common lineage. And it includes everything from beavers to capybaras to mice to hamsters to porcupines to squirrels to gophers. Note that rabbits are usually separated from rodents, even though they are fairly similar.
Now, all these animals share certain features, but that’s because their common ancestor had those features, and all the descendent species still have them.
Yeah, between the rodents and the bats, that covers about 60% of all mammalian species. And they breed like rab… rodents!
Like… bison?
Appearantly mice like snails. Several years ago I had a couple of mice living in my storage shed, and when I went to clean it out, I found dozens of empty/broken snail shells.
Just for the record (not that I don’t think you know, BluePit), ferrets are not rodents; they’re mustelids, related to weasels, skunks, otters and wolverines.
“The rat, although a rodent, is carnivorous”. – O’Brien to Winston Smith, while threatening to turn rats loose on his face, Nineteen Eighty-Four.
Nah, bison aren’t predaceous at all, and even if they were, where would they find something larger to kill?