Unless Activision was running commercials for Freeway a couple of years after it came out (which, of course, is possible), then this could not have happened.
I distinctly remember, when I saw the ads for Freeway, thinking it seemed like a Frogger clone. I know Freeway was coded before Frogger came out; I don't know about the exact timing of its marketing.
Konami developed Frogger and it was released by Sega/Gremlin in 1981. When in that year, I do not know.
Freeway is mentioned in Activision catalog AG-940-05 as being available in Summer 1981 and by the next catalog revision was in release.
I recall seeing Frogger before seeing Freeway, but once again, I am unsure as to the exact release dates of both. Once Frogger for the 2600 came out in 1982, I would suspect people shelved their copies of Freeway and opted for this title.