Yes We can Call the Win Runner scripts from QTP using 
follwing  function:
TSLTest.RunTestEx   from the Expert view or Call to Win 
Runner test Dialog box

ya we can call,

TSLTEST.RUNTEST TESTPATH TESTSET(parameters)

V can call TSL test in Winrunner from QTP by using RunTest 
method.This is supported to Winrunner 7.01 version or later.
But its recomended to use newer RunTestEx method when using 
Winrunner 7.6 or later.
 
here is the syntax for both RunTest and RunTestEx methods:

TSLTest.RunTest testpath,testset [,parameters]

testpath--->path of winrunner test
testset--->the testset in Qualitycenter where the testruns 
are executed.This parameter can be ignored if teststes r 
not stored in QC.

Parameters---->optional

TSLTest.RunTestEx testpath,runminimized,close app 
[parameters]

testpath---path of winrunnertest (string)
runminimized-->indicates whether to open or minimize the 
winrunner during test run (boolean)
closeapp-->indiactes whether to close winrunner when test 
run ends.(boolean)

yes,we can call the winrunner from QTP

In QTP 8.2 version
there is a menu bar 
insert - call to winrunner-test
it will be open the winrunner script.