What do you mean by an egg?
What do you mean by a chicken?
Frogs evolved millions of years before chickens.
Frogs produce eggs.
If you accept frogs existed before chickens would you accept that frogs came before chickens?
Probably a wise old rooster was created first. One of his bones (probably his wishbone!) became a chicken and the rest, as we say, is history. Well, that's the story I'm sticking to.
Eggs were around many millions of years before the chicken evolved. Even most of the dinosaurs species laid eggs. Now, if you would have said chicken eggs or chickens, that would have been a bit more difficult.
And chickens, like all birds, definitely have tongues, and better designed then ours.