There are many different synonyms for the word "tiny skull". Some options might include "minuscule cranium", "petite head", "diminutive skull", or "small-scale cranium". Other possibilities could include "compact noggin", "pint-sized braincase", "little bony structure", or "dainty cranial cavity". Ultimately, the best synonym for "tiny skull" will depend on the specific context in which the phrase is being used and the tone that the writer is trying to convey. By exploring a variety of different options, it is possible to find the perfect synonym to suit any need.