Based on everything in the wiki, there is no report of George Pickens being injured at Cowboys training camp. His page doesn't list any current injury — in fact, all the reporting points to him being a full-go. He signed his franchise tag back in April, OC Klayton Adams has talked up featuring him heavily in 2026, and the offense is expected to have all 11 starters returning (from the George Pickens page).
A few expert clips dance around past injuries — Sal Vetri mentions a past high ankle sprain, and FantasyPros speculated hypothetically about a potential ankle issue if he were to hold out — but none of that is tied to a current training camp injury. As of the latest wiki updates, Pickens is healthy and locked in as the Cowboys' WR2 alongside CeeDee Lamb.