Hello,
Does anyone know if tanning helps cover stretch marks so that they are less noticelable? Or if there are any cover up creams or body markeup that can help cover them?

There's lots of creams and lotions out there that are supposed to be good for stretch marks. I haven't tried them myself so I can't say for sure if they actually work. I wouldn't try deliberately tanning stretch marks. Damaging skin you're already unhappy with just doesn't sound like a good idea.