Could anyone tell me the difference between Tipsy Chasse to L vs Tumble Turn vs Chasse Roll to Left in Foxtrot?
I could not find any reference to Tipsy Chasse to Left, but I heard it's a popular step.
Thanks!

OK, I'll make a start on this one but you may get different opinions.

Description as man:
Foxtrot tumble turn is basically a feather finish into an open toe pivot on the LF.

Chasse Roll to Left is similar but the RF closes to LF on step three instead of forward O/P which makes it a chasse and more appropriate to waltz or quickstep.

Note: I know of one school which refers to a chasse roll to RIGHT as a tumble turn.

I don't think there is a figure called Tipsy Chasse. There is a Tipple chasse and there is a Tipsy. You could try searching for those.

Tipsy chasse:
http://www.youtube.com/watch?v=EClUVm-69Rg

Chasse Roll in foxtrot:
http://www.youtube.com/watch?v=VjdmqDqyQAs&feature=share&list=PLEF3DCFC4D0B72CA8
{But this is to Right instead to Left]

Both very similar to tumble turn, I think.