I will post some of his dialogue from page 552, GoF:
Quote:
"Could I haff a vord?"
~
"Vill you valk vith me"
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"Don't vont to be overheard."
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"I vant to know vot there is between you and Hermy-own-ninny."
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"You haff never... you haff not..."
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"You fly very vell. I vos votching at the first task."
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So, it seems to be that 'w' is replaced with a 'v'. And, some of his 'v's are replaced with 'ff'.
As for Ron mimicking Krum, I don't think he would do a very good job. I think he has tried once or twice, but he does a horrible job. I can't find it in the book, so, I couldn't tell you exactly how he tried to imitate.
I hope I may have helped,
~Andrea