They need toys to chew on to help with teething. I guarantee you that's why they're chewing up everything else. I wouldn't take away the toys they have because that will only encourage them to chew on OTHER things, things you don't want them to chew on.

My pups rip the stuffing out of their stuffed toys, too. That's just what dogs do! My POV is, as long as they're destroying their OWN toys and nothing of yours, theres nothing wrong with that.

Get them some nylabones or some Kong toys, something strong and durable and good to chew on! Encourage chewing on their toys only. For everything else I suggest purchasing some chewing deterring spray (like Bitter Apple) and spray it on anything you DO NOT want them to chew on. If they try chewing on it it will taste nasty and discourage from chewing on things you don't want them to chew on.

Otherwise if you catch them chewing on something they aren't supposed to, tell them "NO!", move them away from the object, and give them a toy to chew on instead. Praise them for chewing on their own toys (get very excited) and say "NO!" when chewing on objects you don't want them to chew on.