gradigger's cage and bridge from below

[Jacemindbreak]

does grafdiggers prevent tokens from coming into play?

[ween]

Nope

Not directly anyway. Grafdigger's Cage stops Ichorid, Narcomoeba from coming back and the flashback on Cabal Therapy and Dread Return though.

[Beatusnox]

Key wording here is 'enter the battlefield from the graveyard'. The tokens appear on the battlefield, they do not come from the graveyard.