Grishnakh was a high-ranking Uruk in the forces of Mordor (otherwise he wouldn't be leading that expedition of Uruks), so he probably had received orders to look out for Gollum (either for the expedition, or years before when they were Sauron was hunting Gollum). Pippin was just smart enough to make the connection between the orc of Mordor and the hunt for the Ring.
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