No, the first normal form is surely scrincaþ (or scrinceþ, if databases aren't feminine) - or maybe scrinceð (or scrincað) or perhaps even gescruncan; even shrinked is a modern aberration, and anyway just the silly southern spelling of shrenkit; shrunk and shrunken are weird hyper-modern forms of schrunken and shronke. Nobody speaks English anymore. 😀

Anyway, "shrinked" (the southern spelling of "shrinkit") has been around for quite a bit more than half a millenium; but ignorant spelling and grammar pedants will claim it's a utterly wrong :angry: so that it's safer to stick to shrunk (past participle or adjective) and shrunken (adjective, possible past participle but not with "have" as auxiliary verb).