Yeah, outside of being intrigued by more snaps/touches for Pollard, the rest of these guys? No, not good enough to play significant downs at 3rd WR.
Devin Smith could be solid there if McCarthy can utilize him correctly and whatever put him in the doghouse for 12 games as a healthy scratch, after averaging 22.6 ypc, went away with the discarded coaching staff.
Hopefully addressed in the draft, (if one of the Big 3 fall to 17, Jalen Reagor, Denzel Mims, Brandon Aiyuk, Michael Pitmman, Jr. Chase Claypool, Lynn Bowden, James Proche)
second wave of free agency ( Taylor Gabriel, Chester Rogers, Paul Richardson) uninspiring I know
or a cheap trade like we did with Tavon Austin (Curtis Samuel, John Ross, etc.)
Your 3rd WR is an extremely important position, and I would guess that McCarthy is very uncomfortable with the current depth.
I love Cooper and Gallup, but for them to be most effective, defenses have to respect that 3rd guy, or else they are going to put their #1 guy on Cooper and then bracket Gallup and dare Dak to beat out with inferior talent.