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If words roll of your tongue - it means that you find your words easily, and are able to express yourself easily.

When he started his speech he sounded nervous, but after 5 minutes the words just rolled off his tongue.
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Is it the same as "slip your tongue"?
New2grammarIs it the same as "slip your tongue"?

No

Rolled off his tongue - the words flowed easily.

A slip of the tongue - to say something by accident/not meaning to say it.

Example

Question Master in a Quiz:

What colour is the white cue ball on a snooker table? - - This would be a slip of the tongue.
Thanks, Optilang. Got it!
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