need help finding something i read

it is about a guy if memory serves me right was a thief) who dies and kinda reincarnate in the body of a fragile young noble who only his mother cares about, and he then learns that he can use ice magic

It sounds like something that might be found on There are a lot of stories that use reincarnation there.

Your best bet is to probably ask over at

They get these sorts of requests a lot and most are answered within a few minutes.

Here's the Royal Road forum for that stuff.

Agreed that the Royal Road community could probably help you out. :)