Have you heard about Chibimals?
The growing library of kid friendly, whimsical models for your 3D printer. Designed FFF-friendly. Perfect as a test print or just for fun. With soft edges and a huge, useful interior, they are suitable for all ages.
These models are carefully designed so that they'll print easy on a home 3D printer. They require no supports and could be printed with zero infill to save on material. That makes these models perfect for a quick print, as the basis for a projects, or for experimental materials like flexible filaments for squishy prints.
What about color prints? While the chibimals print great with single color 3D printers, if you are one of those with a MMU, Palate, or even Davnici color, versions of the 3d models with Multi-material and full color options are included.
EDIT: I noticed some of the makes closed the mouth off. I assume it's depending on the slicer used, so I uploaded a new corrected mesh for the single color Starkey.