What types of jewelry can be used in a tragus piercing for example eyebrow bar tongue bar labret stud can you use these?

Labret studs and any kind of ring are best. You could use an eyebrow bar if you'd like but it can look a bit strange because the ball would point down. Tongue bars are way too long. You could use smaller barbells though, they work just as well as labret studs. Just not the same variety :)