Yes, you will be able to login JIRA using users in Crowd if it is setup properly. You won't have to create a local account in JIRA for each user, but you have to make sure the group for the users in Crowd is included in JIRA Users in the Global Permissions.
The following link might help https://confluence.atlassian.com/display/CROWD/Integrating+Crowd+with+Atlassian+JIRA
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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