Is there any way that an iPod touch can text without wifi
Nope, sorry. Wifi is needed unless your iPod is jail broken, my friend got her iPhone jail broken and she has "wifi" EVERYWHERE. Idk how that works though.
no because if it has no wifi then it would need a phone sevis
No, because it's Internet texting, related to email. If you are not connected to Internet, you can not receive or send any messages.