...I have been unable to track down the ON word for "please", as
in "Please, don't give cheese to dwarfs", etc. NOT as in, "Does this
please you?"

I've been searching through Zoega and did a word search on an online
English translation of Njal's Saga, but I haven't been able to find
it. Does anybody know what it is, just off the top of their head? Or
would it be said differently in ON?

Jamie