What's your question? Ask

Sounds like they may have root rot or a fungus from too much water. These articles may help: https://www.gardeningknowhow.com/plant-problems/disease/root-rot-in-garden-plants.htm
https://www.gardeningknowhow.com/edible/vegetables/peas/how-grow-snow-peas.htm

Powdery mildew is a gray mold usually growing on top of leaves. This link will take you to several articles on growing peas; http://www.google.com/cse?cx=012078378210706707791%3Af1h5n_k1r5e&ie=UTF-8&q=boxwoods&oq=&gs_l=#gsc.tab=0&gsc.q=snow%20pea%20peoblems

I would wait to pinch them until they get planted outside. This article will help with reducing how leggy they are: https://www.gardeningknowhow.com/garden-how-to/seeds/leggy-seedling.htm And here is more information on pinching the peas, if you have not already read it: https://www.gardeningknowhow.com/ornamental/flowers/sweet-pea/pinching-sweet-peas.htm

Yes, you can freeze these peas. Pinch off the ends and pull to remove the strings along the seams of the pods before freezing. The peas must then be blanched before storing in the freezer.

To blanch, add 4 quarts of water to a pot and bring to a boil. Add 2 to 3 cups of pea pods to the boiling water and cover. Allow them to boil for exactly 2 minutes and remove promptly from heat. Drain off water and place the pea pods immediately in a bowl of ice water for 2 minutes. Remove from bowl and dry pea pods on paper towels.

Place the snow peas into freezer bags or containers, seal, label and store in the freezer.

While they can be grown indoors, they need to be given adequate lighting and water. It sounds as if yours may have been given too much or too little water. Check the soil to ensure the plant is not too wet, which can lead to rot. This article will help with that: https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

If it's too dry, you will need to give it a good watering, allowing it to drain out from the pot. Only water when the soil is somewhat dry.