Its overfilled beak looks like a pack of French Fries.
A good container to raise them is a clear
plastic Shoe Box with a tight lid. Larger containers are also suitable. The
Box should have ventilation which can be made by cutting a hole in the lid.
Mealworms are not great climbers and vary seldom fly, but you may want to
attach a piece of Screen to the ventilation hole with a Glue Gun.
They will need to be fed some "meal", like Corn Meal, Chicken
Mash, Wheat Flour, dry breakfast Oatmeal, or the Siftings from your cereal
boxes. These Siftings can be removed with a kitchen Colander. This food is
placed in the bottom of the container 1/4 to 1/2" deep. Place the Worms on
top.
The dark Worm is probably dead. The second one is a normal larvae. Next
is a skin, shed when it becomes the legged stage on the right. They
will multiply best at a room temperature of 70 F. or more. If you don't want
them to become winged adults, place them in your refrigerator, where they
will become dormant. But if left in the heat, they will become adults, lay
thousands of eggs, and die.