I am using this macro for my mounts. (thanks Cogwheel).

Anywho, I want the tooltip to reflect the mount I'm on. Is there anyway to modify the #showtooltip line to autoselect the mount I'm on?

#showtooltip  Ebon Gryphon
/stopmacro [flying]
/use [nomounted] Ebon Gryphon
/use [nomounted] Swift White Ram
/dismount

I did try

#showtooltip Ebon Gryphon, Swift White Ram

the result was to always show the Ebon Gryphon.

I also tried

#showtooltip Ebon Gryphon/ Swift White Ram

which just broke the macro.

It's also worth noting that you could write an addon to do this, if you really wanted to. An AddOn can set the feedback for a macro to be anything it wants, using SetMacroSpell() or SetMacroItem()