It would be best to get one close to Picos age but if you could find one being sold for meat close to picos size you’d be doing a rescue saving a life an giving Pico a friend. It won’t be as tame as Pico probably didn’t have much of a life actually but if your up for it I bet you could tame one and give it a nice life. Please be sure you’d even want to do something like this though. Just saying as sweet a pic you posted of Pico cuddling with you just shows how bonded he is to you. If you ever wanted to let him go at that pond you’d have to do it slowly so he got use to everyone and they him. Or he could end up dead. Or hatch a few more eggs but then you’ll have to raise them up to close to his size before introducing them. Sorry I don’t mean to not be encouraging just hate the thoughts of Pico being put out at that pond and being terrified. Maybe a farmer who raises ducks for market might have one close to Pico age?