Yes, use namespace and resources:
namespace :oauth do
resources :apps, controller: "applications", as: :applications
end
This is not 100% identical (the names of some of your routes have changed) but it is the way you should be building your routes, and you should change the rest of your app to reflect the change.
The primary difference is your names for the create and destroy routes have gone away; these routes shouldn't have names anyways. When you want to create/destroy a model, you should be using oath_applications_path, with method: :post or method: :delete, not oath_apps_new_path/destroy_oauth_application_path.
My way also uses the correct verb (PUT) for updates.
Your rake routes:
oauth_applications GET /oauth/apps(.:format) oauth/applications#index
new_oauth_application GET /oauth/apps/new(.:format) oauth/applications#new
oauth_apps_new POST /oauth/apps/new(.:format) oauth/applications#create
oauth_application GET /oauth/apps/:id(.:format) oauth/applications#show
edit_oauth_application GET /oauth/apps/:id/edit(.:format) oauth/applications#edit
POST /oauth/apps/:id/edit(.:format) oauth/applications#update
destroy_oauth_application DELETE /oauth/apps/:id/destroy(.:format) oauth/applications#destroy
My rake routes (reordered to match yours):
oauth_applications GET /oauth/apps(.:format) oauth/applications#index
new_oauth_application GET /oauth/apps/new(.:format) oauth/applications#new
POST /oauth/apps(.:format) oauth/applications#create
edit_oauth_application oauth_application GET /oauth/apps/:id/edit(.:format) oauth/applications#edit
oauth_applicationoauth/applications#show
edit_oauth_application GET /oauth/apps/:id/edit(.:format) oauth/applications#showapplications#edit
PUT /oauth/apps/:id(.:format) oauth/applications#update
DELETE /oauth/apps/:id(.:format) oauth/applications#destroy