Does a micro usb to Thunderbolt adapter or cable exist?

I have purchased my first iMac and previously I had only used a PC although I have been an iPhone and iPad convert for years. I have two external hard drives that I have reformatted to exfat.

Drive A - utilizes a female Micro USB port. The other end of the current cable is a male USB 2.0 A.

Drive B - utilizes a female USB 3.0 port type B with the other end of the cable a male USB 2.0 A.

1. I'm wondering if the better configuration would be to connect both through the Thunderbolt ports. The one that uses USB 3.0 is 2TB so it would be helpful for faster movement of files if I understand the technology correctly.

2. Are there USB3.0 to Thunderbolt cables available? and/or Are there Micro USB to Thunderbolt cables available?

3. Are there USB 2.0 to Thunderbolt adapters available?

I'm not finding much information on Thunderbolt ports.