Can i make dram using bjt transistors?
Dynamic RAM as some RAM which stores bits in a capacitor and needs to be periodically refreshed, you could make one with a bipolar transistor or even a valve/vacuum tube or a relay.
There were many concepts in early days of computings of memories with only temporary storage.
Dynamic RAM as the concept of using a very clever arrangement of a capacitor made of silicon controlled by a single transistor using MOSFET technology processes, then you cannot replicate it without having a semiconductor fab.