It's quite likely that 'Foggy Dew ' simply arose ...

no evidence even to suggest that 'foggy dew' in this instance is anything but literal
.,,.

'Simply'? Bugaboo universally transmogrified into foggy dew 'simply'?

I know what fog is. And I know what dew is. But in what way can dew 'literally' be foggy, please?

I find your conceptions of 'simplicity' & 'literalness' somewhat equivocal I must say, Steve.

~M~