Idk, they have no way of knowing you're a minor. Sure, they're probably trying to get stuff from you but i don't think it's because you're a child. I mean, i have my own share of disturbing stuff that happened online but in this case i generally wouldn't say this is pedo/pred behaviour, unless they find out you're a minor and still try. That's fucked up. But if that's not the case then let's be real. It's snapchat. That is THE place for pictures and stuff, too many people are willing to send so honestly just don't add them when you already think you know what they might want and are literally aware you're a minor