I vomited at the sight of the Fat berg lol, so Once the fat has solidified (next day) lift off with a spoon then Throw the fat away. wasn't an option
If looking at perfectly good food makes you vomit, that is concerning. Particularly with regard to wasting an entire chicken because the skin wasn't crispy - if you'd taken the skin off, you would have had perfectly moist, tender and juicy cooked chicken underneath.
If I gave you lamb cutlets and told you to cook an Irish stew, would you know how?
Yes. Although as cutlets are stupid expensive, I'd probably make something else with them and use something that cost less than £24 a kilo for a stew.
When you do (if you) cook the chicken thighs, it's likely that there will be some fat and jelly formed as the pan cools. To avoid you throwing up (why? It's natural) again, I'd suggest that you make sure all the cooked thighs are out of the pan and stood on a rack, rather than leaving them to cool in it. And wear rubber gloves to remove the fat/jelly (waste of perfect stock ingredients, but hey) into a container to put into the bin like an empty can, because it can't go down the sink.
Another thing you could do when they are defrosted is remove the skin and cut the bone out, then use the meat in a pan fried dish - if you're not into spices, salt and pepper would do.