You can use any nut butter in place of peanut butter.
For a smoother, more cookie-dough-like texture, use blended oats or Kodiak Cakes flour in place of the oats.
If you're using all-natural peanut butter, you may need to add a little more honey or some melted coconut oil to help bind the protein balls together better (if the mixture seems dry and crumbly).
Homegrown Traditions