I'm not 100% sure on your question but IPs (normally) only print 2 per computer. They are called Bricks coupons and have an identifier all along the sides of the coupon. Take a close look. Tells the company that coupon came from abc IP address, they have printed x number of them and they printed this coupon on Z date at Y time.
~~~Getting up on soap box here~~~~
You cannot photocopy those coupons or alter them. People who do that are committing a crime and they are the reason why many store no longer accept IPs. Do some research on the problems people are creating by stealing from the stores.
I am not saying you would do that, I am just giving you a heads up that this is a hot button issue.
~off soapbox now~
As to using a coupon more than once. No. Coupons are cash. That's all you need to remember. Can you just hand the clerk a single dollar and tell them to use it 10x to cover your $10 bill? Obviously not.

~~I don't think OP said that but someone indicated they did this.
As to the .75 goldfish coupon; you can print 2 from your computer ; yes you can use those 2 on 2 bags of goldfish ; if you have access to more computers and can print more then yes you can use them on a 1:1 ratio basis.
The goldfish at my Kroger are .88 after mega sale (have to buy 10 included items for that price) so they would be .13 per bag after that coupon. Very good deal.
Not all Krogers accept an unlimited amount of coupons. One Kroger in my area only accepts 2 same coupon per order. Doesnt' matter if they are doubling or not. The others accept unlimited same coupon per order but only 2 same will double. (.50 and under double here)
ETA~ I know this comes across really witchy and I apologize. I'm riled up about some other things and it's coming out in my typing.