grep -R "frozenNode" *|grep -v Binary|grep java

frozenNode.txt

fcrepo-http-api/src/test/java/org/fcrepo/integration/http/api/FedoraVersionsIT.java:                    ANY, type.asNode(), createURI(JCR_NT_NAMESPACE + "frozenNode")));
fcrepo-http-commons/src/main/java/org/fcrepo/http/commons/api/rdf/HttpResourceConverter.java:            final Node frozenNode = session.getNodeByIdentifier(label);
fcrepo-http-commons/src/main/java/org/fcrepo/http/commons/api/rdf/HttpResourceConverter.java:            final Property p = frozenNode.getProperty("jcr:frozenUuid");
fcrepo-http-commons/src/main/java/org/fcrepo/http/commons/api/rdf/HttpResourceConverter.java:                    return frozenNode;
fcrepo-http-commons/src/main/java/org/fcrepo/http/commons/responses/ViewHelpers.java:     * Determines whether the subject is of type nt:frozenNode.
fcrepo-http-commons/src/test/java/org/fcrepo/http/commons/api/rdf/HttpResourceConverterTest.java:        when(versionedNode.isNodeType("nt:frozenNode")).thenReturn(true);
fcrepo-http-commons/src/test/java/org/fcrepo/http/commons/responses/ViewHelpersTest.java:        mem.add(new Triple(createURI("a/b/c"), HAS_PRIMARY_TYPE.asNode(), createLiteral("nt:frozenNode")));
fcrepo-kernel-api/src/main/java/org/fcrepo/kernel/api/models/FedoraResource.java:     * managed by the implementation, so hasType("jcr:frozenNode") is a valid use of this method.</p>
fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraJcrConstants.java:    public static final String JCR_FROZEN_NODE = "jcr:frozenNode";
fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraJcrConstants.java:    public static final String FROZEN_NODE = "nt:frozenNode";
fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java:            final Node frozenNode = session.getNodeByIdentifier(label);
fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java:            final Property p = frozenNode.getProperty("jcr:frozenUuid");
fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java:                    return frozenNode;
fcrepo-serialization/src/main/java/org/fcrepo/serialization/JcrXmlSerializer.java:                    if (depth == 1 && nameAttribute != null && "jcr:frozenNode".equals(nameAttribute.getValue())) {

References to frozenNode in fcrepo-http-api, fcrepo-http-commons and fcrepo-http-api should be changed. I'm not too concerned about fcrepo-kernel-modeshape. My understanding is that once the JCR-based import/export features are removed from the API, the fcrepo-serialization module becomes less relevant.