Snuffy & Gibb, "See the king in his golden crown" may well be legit.
It certainly occurs in a 19th C. music-hall sea song called "Little Powder Monkey Jim." Which is not say that other things weren't also sung.

IMHO, "only charge you half a crown" is a little too indirect for folk bawdry. The "half a crown" part sounds absolutely right, but my guess is that unrefined sailors would have said exactly what the "girls" were charging half a crown for.

But "Where the skeeters do bite we" is indeed ridiculous.