Fenton the Feel-Better Fox (also known as The Demon Toy) was a toy that appeared in "The Crying Dame".
Fenton was originally Lori's toy when she was a baby, and was later stored in the attic because of Lori playing his song over and over again. It was then passed down to Lily to keep her from crying. Lynn Sr. and Rita were immediately horrified by this discovery, as they remembered the obnoxious repetition of the toy's song when Lori was a baby. When Lily kept on playing Fenton's song, the rest of the family got annoyed. They later distracted her and, after an elaborate plan, stole Fenton and tossed him into a dumpster. (Presumably behind Flip's Food and Fuel.) The next day, Lily was super depressed because she missed Fenton, so the siblings went to search in the dumpster Lori threw him in. But unfortunately for the kids, Fenton wasn't there. They go to the dump in hopes of still recovering Fenton, but Fenton is sent through a trash compactor and incinerated upon their arrival. To make up for their guilt of destroying their little sister's new favorite toy, Lincoln dresses up as Fenton and does Fenton's dance in front of Lily, while Luna sings its song. Lincoln later states that they might have to sing it for the rest of their lives, but they do it so they can make Lily happy. When the parents came back home from grocery shopping and saw the kids singing and Lincoln in a costume, they put their earmuffs on and ran away screaming in horror.
When its foot is pressed, Fenton sings a song that goes like this:
It does a side-to-side dance as it sings, moving its arms up and down in synchronization while shaking its hips. It has wheels on its feet so it can rotate as it dances.