I wouldn't; rosy red minnows are usually full of parasites.
No they are not
the rosy red fish is the boy.
Yes
to tell the difference between male and female rosy red minnows, look for vertical stripes and fleshy growths on the head. Females lack both.
No but they can eat guppys
they will always accept small live minnows or rosy reds, but try not to let them rely on this diet. start with blood worms and wean them off the live fish
Yes, at least I have. The only fish that bothered the guppies was the red sailfin shark and tiger and rosy barbs, so I moved them to another tank.
There are fish that are a "rosy red" colour that are livebearers. There are both Platties and Swordtails that can have such colouring. But if you are referring to a fish that is called a "Rosy Red Barb" then these are egg layers.
the fish will have dots
Depends on what he looks like, or does. Maybe something that has to do with fire, orange, or if he's fast bolt, lightning.
The turtle will likely eat the rosy barbs if they are small enough.
If by "Rosy Red" you mean a Rosy Barb they can live for 4 years or so. If they are used as a 'feeder fish" their life span obviously would only last as long as they are not fed to something.
Yes they will, as long as the turtle is big enough to eat the size goldfish you are providing for it. Though, I would not recommend feeding them goldfish as they are fatty and unbalanced. As far as live fish go, I recommend feeding minnows or rosy reds.