From the very first time Bing Bong appear in the movie, I already sensed that he is very similar... to Olaf of Frozen! Here are some of the likenesses I have discovered so far! I have enumerated 12 resemblances.
1. Both have similar design such close gap between the eyes, wide mouth, and long nose. Moreover, both have a very similar pose in this promotional picture.
2. Both have alike personalities. They are easygoing, cheerful, talkative, and, of course, imaginative.
3. Both appeared and talked for the first time in the middle of the story.