The answer to this is a definite maybe. All USB ports supply 5v, with a max current on most tvs of 0.5 amps, in accord with the first version of the USB specs. This is not enough to run a Roku reliably. It may start up and work okay for a while but when some program or channel puts a higher demand on it the Roku will falter.
Some tvs however do supply the 1 amp needed, but the general recommendation is to plug the Roku into house power to avoid potential problems.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you.
Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
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