I'm a certified yoga teacher and frankly, other than simple breathing exercises and meditation and the Joint Freeing Series, I'm wary of giving a list of traditional asana to do without being able to ask the student a whole heck of a lot of questions so we can find out what is right for them. And even then it's so important to have a trained teacher who can help you with corrections.
There are SO MANY absolutely terrible videos out there for, "Yoga for Crohn's Disease" and such. And it makes me furious. There are so many contraindications for people with Crohn's and the people putting out these videos obviously know nothing about Crohn's or IBD.
The best advice I can suggest is finding a yoga teacher in your area who understand Crohn's somehow and is an EXCELLENT teacher. That may be hard to do
But call around to the studies. Tell them you have Crohn's disease and you need a master teacher who understands what that entails.