Duffy is a character from Work It Out Wombats
https://pbskids.org/videos/watch/work-it-out-wombats-full-episodes/1385812/malik-gets-muddy-balloonasaur-delivery/1467855
Work it Out Wombats on Youtube
You'll probably want to grab prompts from the images as examples to use. Most of which were generated with ComfyUI. I'll try to remember to come back and put a sample prompt here later.