I have this feeling Kristoff’s first examples/concept art was inspired, or at least similar, to that style of Sir Kay from 1963’s Sword in the Stone.
It’s the flatter hair, parted, as seen in the first gif when Kristoff takes off his hat. The scrunched up grumpy face/bridge of the nose. The long jaw to chin (although Kay’s is longer). And maybe a bit of the big nose although they are shaped a bit differently.