Total flop! My delicious potato and wheat burger buns that were shaped as raw dough and frozen? Didn’t rise properly after thawing. I’m unclear as to whether they needed more time or the yeast was just kaput. I thawed them in the fridge then let them rise at room temperature for 4.5 hrs. They were heavy and dense with no off flavors (like a soft pretzel). I proofed them warm but they just never grew properly. Here’s how they were last time.
Can anyone enlighten me as to what may have happened?

