Hi Kelly,
From one parent of an Octonauts fan to another, I can totally relate to your hopes to find them at Walt Disney World. My youngest absolutely adores them. However, there are currently not any meet and greets with any of the Octonauts characters at Walt Disney World. As an alternative, there is the
Disney Junior-Live on Stage show at Disney's Hollywood Studios with other favorites like Jake and the Neverland Pirates and Doc McStuffins. My two year old son (who loves Octonauts) was just as excited to see these other favorites about a month ago on our vacation there.
We also enjoyed the Disney Junior Play 'n Dine character breakfast at Hollywood and Vine, also at Hollywood Studios. He loved getting to hug Jake, Special Agent Oso, June from the Little Einsteins and Handy Manny. Keep in mind, character experiences can vary day to day.
I have no doubt that he'll have plenty of other awesome memories despite missing the Octonauts. Have a magical vacation.
~Allison L