If I have a Security Freeze on my credit, can someone mar my credit rating?

I have a security freeze with all 3 credit bureaus.

Can a collection agency write them and mar my credit (falsely i might add) and if they did, would this be able to get on my credit report/score even though I have freezes on them?

and if I temporarily unfreeze my credit to get the report, could this be on the report if they wrote the bureaus?

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