Hi Sloan!
Visiting the
Disneyland Resort with three kids sounds like a lot of fun!
At this time, the Disneyland Resort
does not allow strollers larger than 36" x 52" and wagons inside the Parks.
There are single
stroller rentals available. The rates for those are $15 per day for one stroller or $25 for two strollers.
The Disneyland Resort strollers are jogging strollers. They're very easy to maneuver around the Parks. However, since you would essentially need three adults to push three different strollers, I would consider either bringing your own or using a third-party stroller company like City Stroller Rentals.
I'm not sure if City Stroller Rentals offers a stroller that can accommodate three kids but they certainly have a wide range of options and the best part of all, they deliver to your Disneyland Resort Hotel or Good Neighbor Hotel room.
I hope this helps!
Thanks for stopping by the Disney Parks Moms Panel and have a Magical time!
-Anabel M.