You can. You can purchase a traditional style (picture) frame, however, you must remove the glass as the acrylic paint will stick to the glass. Some canvas sizes are hard to find in a traditional picture frame.
A traditional frame is designed for your "picture" to be loaded from the back. Therefore, the opening may not be deep enough for the canvas not to protrude out the back. The bulk of the canvases I use are 5/8" inch in depth. Flat canvas panels are just that...flat so they will easily fit into a traditional frame.
Shadowbox frames can be a viable choice based on the depth of the frame box.
I have used all of the above type of frames. I have located some at Michaels and Hobby Lobby in their clearance aisles. Thrift stores, Goodwill and flea markets are a good place to check as well.