The ascendancy of Danish rule was in the eleventh century; but (with a few exceptions) it was long before words which must really have been introduced at that time began to appear in our literature.

They must certainly have been looked upon, at the first, as being rustic or dialectal.

I have nowhere seen it remarked, and I therefore call attention to the fact, that a certain note of rustic origin still clings to many words of this class; and I would instance such as these: bawl, bloated, blunder, bungle, clog, clown, clumsy, to cow, to craze, dowdy, dregs, dump, and many more of a like character.
I do not say that such words cannot be employed in serious literature; but they require skillful handling.
For further information, see the chapter on "The Scandinavian Element in English," in my _Principles of English Etymology, Series I_.
With regard to dialectal Scandinavian, see the List of English Words, as compared with Icelandic, in my Appendix to Cleasby and Vigfusson's _Icelandic Dictionary_.

In this long list, filling 80 columns, the dialectal words are marked with a dagger {+*}.

But the list of these is by no means exhaustive, and it will require a careful search through the pages of the _English Dialect Dictionary_ to do justice to the wealth of this Old Norse element.