Do any of the Catholic churches use actual bread rather than the disks?
I can only speak about the Latin rite, though I understand that the Eastern rites can use leavened bread.
For the Latin rite, only flour and water are allowed to be used to make the bread. If a Latin rite Church used a different bread would certainly be illicit and would very likely invalidate the sacrament.
SD
Not to start a fight but the unleavened hosts used by Catholics is actual bread just as the unleavened bread used by Jews at Passover is actual bread.
Yes. The Byzantine Catholic rite uses homemade leavened bread made with the purest ingredients. I believe the Orthodox also use such a loaf.
It is actual bread.