This page uses data from the Miitopia Param Info spreadsheet, compiled by PibPasquale, Kobazco, and UglyFrenchFry.
The Bone Biscuit ★★ is three biscuits; two bone-shaped ones with six holes and a skull-shaped one with dollops of chocolate in the eyes. The bone-shaped ones look suspiciously like dog treats...
(Has sparkles, only V. Rare foods have this.)