I wonder if anyone has ever come across any of these words in use outside of this poem:
"Thou, paw-paw-paw; thou, glurd; thou, spotted
Glurd; thou, whitestap, lurching through
The high-grown brush; thou, pliant-footed,
Implex; thou, awagabu."
http://www.northshore.net/homepages/hope/engHollander.html

The glurd interests me, as the poet uses the word twice. While I am almost certain that "glurd" is an ivention of the poet, as the other names seem to be, I would be interested to learn otherwise.