Frank appeared in a few episodes of Men in Black: The Series, with virtually the same role as in the previous two films. The man in the kiosk is different from the one in the first movie; the man is revealed to be a robot in which Frank presses a button to make him talk ("Make it snappy, we're closing!"), this may also apply to the one from the first movie since he doesn't appear to move that much. Humorously, Frank's true alien form still resembles a pug, albeit with a dark green color, antennas, and a 3-pointed tail; however, the series is usually not considered canon, due to the release of Men in Black II.
Read more about this topic: Frank The Pug