Is it a plastic squeak toy or a plush one? Yes, just keep an eye on if they are eating it. They should enjoy it, my kids love rolling their stuff around and into their houses, and then cuddling with them! Go to this site for some more fun ideas of toys. www.guineapigcages.com/toys.htm Have fun!
one thing you could do and it would be safe is take the stuffing out and fill it with hay and close it up. one thing i would watch out for is if they start eatting the plastic that is also bad for them they shouldnt eat plastic so watch out for that