Yea the second picture definitely trochus, that first picture looks more turbo. Either way both great snails, if the ones are trochus your buddy gave to a great gift as they are hard to get everyone seems to be out of them and they sell for $4 each if your find them.
Thanks for the replies appreciate it a lot. So it is okay to toss them on my tank then? He told me he only bought like a couple a year ago and now there must be 50+ on his tank. Can snails really spawns on our tank?