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Could that be the 1967 Hanna-Barbera version of Jack and the Beanstalk? I thought it was Disney as well until I looked it up again for your query. Who'da thunk it was HB instead? This
is probably the "Wokka Birds" sequence you're refering to. Strangely enough there is no Wikipedia page about this show, especially since it stars Gene Kelly and it is said to have won an award or two. So I looked up "Bean Stalk Gene Kelly" (no innuendos intended) on youtube. Hope this helps!

A film that prominently used the Roger Rabbit Effect - it was aimed at kids and I remember it sort of having the look of Disney's early uses of that trope, as in Mary Poppins or Pete's Dragon and the like, though I'm not sure if it actually was Disney or not. I mainly remember the main characters (a live action man and one or more kids) being rescued by ostrich-like birds that call themselves "Wokka Birds" (which were animated), and then the birds go into a song and dance number once asked what a "wokka bird" is.
Edited by MikeK