Need help with few IDs

[fossil35]

Have a few fossils wasn't sure of ID and hoping for any possible help with. They are from Wyoming. The Lance Formation.

 

#1 (sorry on this photo fossil was on side of matrix) (was thinking maybe fish tooth?)

 

 

#2 (maybe croc tooth)

 

 

#3 (not sure at all)

 

 

#4 (fish tooth? or maybe reptile?)

 

 

#5 (wasn't sure if it was some kind of bone piece or turtle piece maybe?)

 

 

The back looks as if broke and was around or hollow at one end