Whipped up a JSFL to print out all your frame labels in a label:

var layers = fl.getDocumentDOM().getTimeline().layers;

var hasSeenFrames = new Array();
var frameLabelArray = new Array();

for (var i = 0; i < layers.length; i++)
{
 var frames = layers[i].frames;
 
 for (j = 0; j < frames.length; j++)
 {
  if (frames[j].labelType == 'name')
  {
   if (hasSeenFrames[frames[j].name] == undefined)
   {
    hasSeenFrames[frames[j].name] = 1;
    frameLabelArray.push(frames[j].name);
   }
  }
 }
}

for (var i = 0; i < frameLabelArray.length; ++i)
{
 fl.trace(frameLabelArray[i]);
}