Add this script to a "Batch Script" editor (F10) and execute it with Script > Run.
Find all polygon objects in a group named "Scene_Nodes" and print their names to the "Messages" panel:
group = scene.getGroup("Scene_Nodes")
groupNodes = group.getNodes()
for entry in groupNodes:
if (entry.getType() == TYPE_OBJECT):
scene.message("Object name: " + entry.getName())