There are no recent public polls on these candidates that I could find, but I linked to what is available. I will update this if polls are published. Most House seats are safely Democratic or safely Republican. Currently the House is comprised of 220 Republicans, 211 Democrats and four vacancies.
Kristen McDonald Rivet
MI-08
Rudy Salas
CA-22
Lenon Baccam
IA-03
Missy Cotter Smasal
VA-02
Janelle Byrum
OR-05
Tony Vargas
NE-02 "In the internal [March 29] polling, Vargas led Bacon 46%-43% among voters surveyed in the Omaha-based 2nd Congressional District." Source
Janelle Stelson
PA-10 "The [June 6th] Franklin & Marshall College Poll shows Perry with 45% to Stelson’s 44% with 11% undecided." Source
Amish Shah
AZ-01
Adam Gray
CA-13
Derek Tran
CA-45 "According to a [June 7th] poll by the Washington Examiner, when likely voters were asked about each candidate by name, Tran received 41% of support amongst those polled, compared to Steel’s 42%." Source
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Comments on "Here are the challengers that big money Democrat donors hope can flip some House seats":
Missy Cotter Smasal
VA-02
Kiggans posted a statistically insignificant 1-point lead — 46 percent to 45 percent for Cotter Smasal — among likely voters, down from a 5-point lead for Kiggans in a Wason Center poll in mid-September. The polls have a margin of error of 3.9 percentage points; 8 percent said they were undecided. Source
Janelle Byrum
OR-05
The poll surveyed 419 likely Oregon voters between Aug. 26-28 and found 43% supported Bynum and 42% supported Chavez DeRemer, with 14% unsure. Inside Elections reported a margin of error of +/- 4.8%, noting totals were rounded. Source
Tony Vargas
NE-02
The latest hint is a campaign poll funded by Democratic State Sen. Tony Vargas shared with the Nebraska Examiner this week that indicated he was leading Republican U.S. Rep. Don Bacon by 2 percentage points, 46%-44%, with 9% undecided. Source
Janelle Stelson
PA-10
Harrisburg-based Susquehanna Polling and Research released the poll that shows Stelson leading Perry 48% to 39% with a 5% margin of error. Source
Amish Shah
AZ-01
No polling found
Adam Gray
CA-13
No polling found
Derek Tran
CA-45
A new poll, commissioned by the DCCC in California’s 45th Congressional District, shows Derek Tran leading vulnerable GOP incumbent Michelle Steel 48% to 45%. This marks the 3rd public poll with Tran leading Steel since early September, proving Tran’s strong momentum in the closing weeks. Source