Can I download Yosemite onto a thumb drive and install it on snow leopard later

can I download Yosemite onto a thumb drive and install it on snow leopard later

Yes.
Create a bootable installer for OS X Mavericks or Yosemite - Apple Support
Open the Terminal in the Utilities folder. Copy and paste the following command line in its entirety into the Terminal window.
sudo /Applications/Install\ OS\ X\ Yosemite\ Developer\ Preview.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite\ Developer\ Preview.app --nointeraction
Press RETURN, enter admin password (will not echo to the window) then press RETURN again.
You need to have the installer in your Applications folder or change the paths in the above command line.

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