"Can walkie-talkies be heard on a shortwave radio?"
Yes, but not the kind of walkie-talkies that are discussed on this part of the site, unless your SW rig's a multiband unit that also receives UHF (and for sake of completion, VHF.)
" If so,what are the frequencies?"
Well, since you asked:
01 462.5625 } G
02 462.5875 } M
03 462.6125 } R
04 462.6375 } S &
05 462.6625 } F
06 462.6875 } R
07 462.7125 } S
08 467.5625 }
09 467.5875 }
10 467.6125 } F
11 467.6375 } R
12 467.6625 } S
13 467.6875 }
14 467.7125 }
15 462.550 }
16 462.575 }
17 462.600 } G
18 462.625 } M
19 462.650 } R
20 462.675 } S
21 462.700 }
22 462.725 }
And for sake of completion, since it's also occasionally discussed here:
01 151.820* } M
02 151.880* } U
03 151.940* } R
04 154.570^ } S
05 154.600^ }
There you go.
__________________________________________________
* Maximum 11.25 kHz deviation
^ Maximum 20 kHz deviation