I use the command "Give" for our dog when we want her to return a toy we have thrown etc. I like that because it's a positive word and completely different to "Leave it".
You'll need lots of treats, or if you are using kibble your pup can work for its food.
Just be prepared to try a technique and tweak it for your pup, or try something completely different. I tried some techniques on our dog when she was a pup and they were hopeless for her, but others worked really well.
And we will need pictures.