Any Way To Get A Set Of Seedless And Seedful Tangerine Photos?

I’m a software engineer, not super proficient in ML yet, so forgive me if my question is unrealistic.

Anyway, I want to create an app that detects whether there are seeds in a tangerine from a photo. Seedless tangerines slightly differ from seedful ones, so I believe this is somehow possible to implement. Since there is no pre-trained model for this, I’m ready to create my own, but gathering thousands of photos is an impossible mission task for me. How are tasks like this usually tackled?