They are the same thing. The terminology was changed relatively recently (from "freeze" to "hold"), maybe version 10.3? There shouldn't be any current documentation that uses the term "freeze", but of course the documentation for older versions will continue to use the terms present in the UI of those versions. Perhaps you're looking at the documentation from different releases? If you have any specific examples of where we're using the incorrect term I can pass it along to the User Education team.