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No, currently in vanilla Minecraft dinosaurs are not in the game. This means there are no spawn eggs for them.
You can find eggs, those can spawn a chicken but not all eggs do, or load new chunks and they will spawn, just not where you want
You can't. They can only be spawned in by a player in creative mode. (Although some mods do add crafting recipes for spawn eggs)
If you mean "throw" like with chicken eggs, then no, you can't.
There is no button to spawn eggs in minecraft, unless you are in creative mode in which case you press the Inventory button. Creative mode can be made to happen when you create a creative world or install a mod that lets you switch gamemodes ingame.