There is, but you'll need to actively work for it.
Simply go to the Sanctuary on the world map and enter the room in which your trophy will pop up if you have saved all 12 friends.
There, you will be able to see every friend you have saved so far. Compare the ones you already have with the ones in this video:
If the video is no longer available, you can always Google a list of friends and perform an image search for that particular character. All friends are characters from another game.
If you see a duck that looks nothing like the characters at the beginning of the video, that's one of the Hyperducks. The one from Aurora Village wears a purple vest, while the other from Abadis Forest wears a red one. Once you've saved the both of them, they'll wear the blue suit and the high-tech helmets as seen at the beginning of the video.