Disclaimer: I don't own anything that is Harry Potter; J.K. Rowling owns it all.
You are lovingly manufactured in a magical factory somewhere not far from Hogwarts. Then you wake up to your first dawn of life as a spell animates you for the rest of your existence. You realize that you can move and act, and even sound, just like your namesake.
Then, of course, they trap you in a tiny, thin, cardboard box along with a pentagon-shaped trading card with a fabulously famous wizard or witch on it, and close the lid on you. You see little other than perpetual darkness and maybe a glimpse of the face on the card, if the scant light is good.
After an indeterminate amount of time passes, some kid obtains you, and opens your box. You might try to make an escape, a bid for freedom, in spite of not having much to live for, being small, delicate and make of chocolate. You might succeed. Or you might fail, being caught by the kid, and subsequently devoured with delight (the kid's delight), and your abbreviated life ends before it even began.
Then the kid forgets all about you and begins to take pleasure in his/her trading card and the figure framed on it.
This is what it is to be a Chocolate Frog.