I think the jibbitz fit in the disney crocs, but they aren't recommended, since they are bigger holes and can fall out easier. I have seen people in the parks with the disney jibbitz in the disney crocs, and haven't seen any issues, so maybe it's just the crocs brand saying that so they aren't liable, cause the jibbitz at disney are EXPENSIVE!!! $4.95 for ONE!! I have a few, but dang!!
My DD had Mickey Mouse Crocs last year and had Jibbitz in them, however, as PP mentioned, the DO fall out easier. I think she ended up loosing one of them and I know her Cinderella one kept falling out...luckily we kept finding it.
This year I am sticking with the regular Crocs and will embelish them with Disney Jibbitz