Is it safe for non- browned ground turkey in a crock? I've always heard "brown first!"
"Brown first" is usually done for flavor and color, not safety reasons. As long as your crockpot throughly cooks the meat to 165F, it is safe to eat.
I agree with HalfPint's answer. But to keep them from falling apart you need binding agents like egg yolk and bread crumb. I know everyone (except me) is using turkey leftovers this week, but turkey is probably my least favorite form of meatball. But good luck.