No, Punchh does not filter for inappropriate names when the guest is signing up. If you wish to change the name of a guest that has an inappropriate name or deactivate the account, you can do so via the guest account directly.
To edit the name, head to the guest account and select Edit Profile and edit the name of the guest.
To deactivate the account, head to the guest account and select Edit Profile > Guest Functions > Deactivate.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)