Mix buttermilk, shortening, eggs, and salt in a bowl. Mix all-purpose flour, oat flour, teff flour, protein powder, sugar, baking powder, and baking soda together in a separate bowl. Pour flour mixture into buttermilk mixture slowly; stir to combine.
Heat a lightly oiled griddle over medium-high heat. Drop batter by large spoonfuls onto the griddle and cook until bubbles form and the edges are dry, 3 to 4 minutes. Flip and cook until browned on the other side, 2 to 3 minutes. Repeat with remaining batter.
