If you have your ice packs with you or in your carry-on luggage:
If the ice pack is in gel form or not frozen it may be confiscated by the TSA. If the ice pack is in frozen or in solid form it likely will not be confiscated by the TSA.
If the ice pack is in your check-in luggage:
It likely will not be confiscated by TSA regardless if it is in gel form (unfrozen) or solid form (frozen).
For more official information about TSA regulations regarding flying with liquids, please visit their website: https://www.tsa.gov/travel/security-screening/liquids-rule
In the event that your ice packs are confiscated by TSA, they will not be replaced under the product warranty.