In stature the Manlet was dwarfish--
No burly, big Blunderbore he;
And he wearily gazed on the crawfish
His Wifelet had dressed for his tea.
"Now reach me, sweet Atom, my gunlet,
A manlet is simply a short man, although there seems to be little consensus as to what constitutes shortness.  Blunderbore  is a reference to a giant from Cornish and English folklore, a non-manlet if you will. 
 
 Can you guess which one is the manlet?
The Manlet