If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command.

The oc describe command can be used to list the containers in a deployment or a pod. In this example, the deployment named "php" contains one container named "php-74"

~]$ oc describe deployment php-74
Name:                   php-74
Namespace:              foo
Pod Template:
  Containers:
   php-74:
    Image:        registry.redhat.io/ubi8/php-74@sha256:9b0179ab95c05af2ad8836a6fc6078da92833c63610c1dfe9f0fb51519e9b545
    Ports:        8443/TCP, 8080/TCP
    Host Ports:   0/TCP, 0/TCP
    Environment:  <none>
    Mounts:       <none>

Likewise, in this example, the pod named php-74-64c9588895-qgxjc contains one container named "php-74".

~]$ oc describe pod php-74-64c9588895-qgxjc
Name:         php-74-64c9588895-qgxjc
Namespace:    foo
Containers:
 php-74:
  Image:        registry.redhat.io/ubi8/php-74@sha256:9b0179ab95c05af2ad8836a6fc6078da92833c63610c1dfe9f0fb51519e9b545
  Ports:        8443/TCP, 8080/TCP
  Host Ports:   0/TCP, 0/TCP
  Environment:  <none>
  Mounts:       <none>

Or, the oc get command with the --output jsonpath option can be used to return the name of the containers in a deployment or a pod.

~]$ oc get pod my-app-wzvjr --output jsonpath={.spec.containers[*].name}
my-foo-container my-bar-container