We've been using a really big crown knuckle bone along with the cool kong (filled with yogurt or BP and Frozen) the chewber and the nylabone rhino super tuff bone.
Tine, nylabone makes dozens of different types of chews, both edible and non-edible. Also they come in super tiny right up to Giant sized for the more powerful chewers.
Bottle buddies are a hit here too, with or without cold water in the bottle. These are great because the bottle is secured within the stuffed animal so fragments cant be eaten as the break them apart and you can open it up after and replace the bottle with another one you have around the house.
I sometimes soak the knotted rope toys in chicken broth and then freeze them too. The all love those! I'd recommend replacing them often though