Have you tried a Kong? If you get the right size/variety for them, they might like it. Some dogs do.
The problems at this age, are:
They will choose to chew a lot of the time at different times throughout their teething.
You can't give some high end chews, which are generally food based, that often.
One way to make a Kong irresistible, besides making sure that it's the right size and density for their small teeth and jaws, is to stuff it with something that they need to work on to get out. That can really keep them busy.
And, you can make the stuffing something healthy, like a little yogurt with some vegetables mixed in, then frozen.
Peanut butter is often used, but I worry about too much fat with some dogs, so what about mixing a little peanut butter with some yogurt? They can probably have that twice a day if the filling doesn't add up to much.
If you choose to feed a fat, like peanut butter, and they aren't currently eating it, it is sometimes best to start slow to allow their systems to adjust to the fat.
A lot of things that we used to give our dogs turned out not to be healthy, in the end. And, some are choking hazards.
Even with a 'safe' chew, you need to examine them frequently to make sure that they aren't biting chunks that can be swallowed, or choked on, off.
Well, good luck. I know this stage, and it's not a fun one!
Love All Life, Thank You For Posting! :)