We did all kinds of crazy things to try to get our first poults to eat, like wrap stones in tinfoil to have "shiny" things for them to peck at in the food dish and constantly dipping their beaks in water and food. Somehow they eventually figured it out, even though we were exasperated and thought they would die. They didn't! Plus I think they were eating when we weren't looking.
Also, I've heard they go for dark-colored things first, and feed is generally light colored. Perhaps put a few tiny bugs in there? Or tiny bits of cut up grass? Also, since they're attracted to red, use a red dish.
Turkeys don't sit and gobble food like chickens do... they eat a few bites then walk around then eat a few bites...kind of like a persnikety eater.
But I would try the beak dipping thing repeatedly. The yolks are good too. Just put it on a dish for them and theyll start eating it even if it takes a day or two or three.
I found my poults like hardboiled egg yolks, when I left them in small chunks, rather than completely mashed in miniscule crumbs. keep us posted.