People Buy Me to Eat

My body is long. I am very healthy.

You can make juice from me. I wear an orange coat. 

I grow underground.

Who I am?

I have 4 corners. I have 4 sides.

I have 2 long sides and 2 short sides.

Who I am?

It is purple. It is Long.

It is a softer vegetable. It grows from a plant.

What is it?

If 

111 = 13

112 = 24

113 = 35

114 = 46

115 = 57

Then

116 = .....???

I am found in the freezer. I taste good on a sunny day.

I come in many different flavours. I am made of cream.

What am I?