If your talking specifically about ficus carica, I had a few and sold them. I also sold a Ficus Benjamina and kept a Ficus Microcarpa Tiger Bark / Kinmen / Golden Gate. Enjoyable trees - and fruit - but it's hard to keep the leaves small. One year, I was able to keep the leaves a few inches wide on one of my trees. I think it just put out more foliage than usual. After a repot the next year, the leaves were back to full size. My space is limited, so I sold all my trees with larger leaves (aka, trees that needed to be larger to be in scale), including my figs. There are other trees with oak-lobed leaves that may be more suitable for bonsai, such as Hawthorn, many people regard Oak as challenging.