Wrenched rhyme is a name used to describe a word's being forced into unnatural pronunciation--usually for comic purposes--in order to make a rhyme:

 Although he's shipped
            To the Persian Gulf, her
            Body's been dipped
            In burning sulphur.
                        --Elinor Wylie

And pulpit, drum ecclesiastic,
Was beat with fist instead of a stick;
Then did Sir Knight abandon dwelling,
And out he wrode a-colonelling.

The first of these is also a mosaic rhyme.
 

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