There are a some botak trees around, but like have been mentioned it will either be amongst other 'healthy' trees or some uninteresting or a cluttered background. But you never know. Maybe you can try the park which used to be the old Bidadari Muslim cemetary, or maybe along Tampines Ave 10/Pasir Ris Dr 12, or Pasir Ris 8. Keep your eyes open when travelling around. Better still just go out and explore if you have the time
I've seen some along the TPE. Just drive towards punggol side. Keep left all the way but don't turn to KPE and you will see some botak trees. BUT, it's hard to get there because you can't stop and park beside the Xpressway. If you don't have a car, take 27 or 34 opposite IKEA, sit on the left and you can see it too.