Uh, yeah. A year or so ago, when Ella was somewhere between 18 and 24 months, she'd hide food in her cheeks, behind her molars, for HOURS. We'd eaten a late afternoon dinner and had gone shopping. I was talking to one of the sales associates who was a former coworker and noticed that Ella is smacking away at something. We'd eaten at least two hours prior to this, so I was curious what it was. I pried her mouth open (because she didn't want to give it up), and it was a disgusting, bleached-out chunk of shrimp. Blerg.
She doesn't pack her mouth anymore for hybernation, so there is hope for Gabrielle. FWIW, that incident was not her last mouth-packing event, but we never made it an issue and she did stop. Eventually.