Hello Emily,
My youngest is a huge Chuggington fan, as well as many other Disney Junior shows. Unfortunately, there are not any attractions or characters from that particular show available at Walt Disney World. However, you should definitely check out
Disney Junior - Live on Stage! at Disney's Hollywood Studios. This stage show features several shows from this popular channel, such as Mickey Mouse Clubhouse, Doc McStuffins, and Jake and the Neverland Pirates. There are also various characters from Disney Junior available near the entrance to this show throughout the day, so be sure to check a times guide or the My Disney Experience Mobile app for the most up to date times and locations.
Lastly, I'd suggest the character breakfast or lunch at
Hollywood & Vine, also in Disney's Hollywood Studios. This is a fantastic buffet meal that features, Jake the Neverland Pirate, Sofia the First and a few others. My littlest kids have always enjoyed this meal through the years.
Have a wonderful time.
~Allison L