When you you are boiling a pot to kosher for Passover can I throw in the utensils at the same time after the water boils?
Yes you can
If the pots or frying pan have scratches is it still ok to use on Passover after boiling?
Yes
Can you kosher a pot on chol hamoed
This is complicated but simple.
Anything that can only become kosher thru boiling water cannot be done on Pesach. Anything that can be koshered thru Libun, can be done on Chol Hamoed. (Not allowed on Yom Tov). Any pot or utensil can be koshered with Libun, but you have to be careful the extra heat it’s not used to, doesn’t destroy it