What native Fibre Channel technology facilitates connecting multiple Fibre devices behind a single FC address?

Fibre Channel over Ethernet (FCoE) is a protocol that encapsulates FC frames inside Ethernet frames for converged network transport, and has nothing to do with aggregating multiple FC devices behind a single FC address.

In NPV mode the edge switch acts as a proxy for all attached N_Ports, using NPIV on its uplinks so that each connected device logs into the fabric through one or more shared physical FC uplink addresses. This effectively places multiple physical FC devices behind a single FC-addressed uplink on the NPV switch, satisfying the question's description exactly.

Fibre Channel Arbitrated Loop (FC-AL) is a legacy shared-loop topology where all devices share bandwidth on a single loop; it does not multiplex multiple devices behind one FC address.

N-Port ID Virtualization (NPIV) creates multiple virtual N_Port IDs on a single physical port for one logical device such as a hypervisor HBA - it virtualizes one port outward, rather than aggregating multiple separate physical devices behind a single connection.