There is a waze:// url that open the waze standard app but I can't find a carpool deeplink to do the same.
All supported deeplink documentation for waze are in here
This documentation describes what features are supported by deeplink and waze sdk.
After playing with some link (within iPhone safari browser) which invoke the waze carpoll app install, i figure out two undocumented way.
com.waze.rider://
wazerider://
The first one is more robust and not likely to be changed in near future.
NB: Don't forget to add these into your info.plist
> LSApplicationQueriesSchemes
.