Sunless Citadel, a very famed 1-4 adventure module brought forward into 5e in Tales from the Yawning Portal, has an ice dragon wrymling in it, towards the end. It's not actually the final encounter, and the adventurers are gently pushed towards subduing it rather than killing it, for in-story reasons.
For the record, yes, Whites are brutish and dumb, as far as dragons go. Comparatively, Greens are the schemers and enjoy plans and plots more than any other chromatic type.
