[tel]

Not quite. I would argue the total opposite in fact.

The cited study postulates in the discussion that Tip of Tongue events come from simple reduced frequency of use in any given word stemming from a much larger lexicon. There's no evidence at all suggest that there's actually a neurological disadvantage to bilingualism.

Also, it seems pretty counterintuitive to think that practice in an entirely new cognitive arena, something like a new language, could do anything but improve your ability to process language. If there's a paper out there I'd love to read it.