Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of U.S. state amphibians
Table title:
Table
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > State </th><th colspan=1 rowspan=1 > State amphibian </th><th colspan=1 rowspan=1 > Binomial nomenclature </th><th colspan=1 rowspan=1 > Photo </th><th colspan=1 rowspan=1 > Year </th></tr>
<tr> <td colspan=1 rowspan=1 > Alabama </td><td colspan=1 rowspan=1 > Red Hills salamander </td><td colspan=1 rowspan=1 > Phaeognathus hubrichti </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2000 </td></tr>
<tr> <td colspan=1 rowspan=1 > Arizona </td><td colspan=1 rowspan=1 > Arizona tree frog </td><td colspan=1 rowspan=1 > Hyla eximia </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 1986 </td></tr>
<tr> <td colspan=1 rowspan=1 > California </td><td colspan=1 rowspan=1 > California red-legged frog </td><td colspan=1 rowspan=1 > Rana draytonii </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2014 </td></tr>
<tr> <td colspan=1 rowspan=1 > Colorado </td><td colspan=1 rowspan=1 > Western tiger salamander </td><td colspan=1 rowspan=1 > Ambystoma mavortium </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2012 </td></tr>
<tr> <td colspan=1 rowspan=1 > Georgia </td><td colspan=1 rowspan=1 > American green tree frog </td><td colspan=1 rowspan=1 > Hyla cinerea </td><td colspan=1 rowspan=1 > American green tree frog 1.JPG </td><td colspan=1 rowspan=1 > 2005 </td></tr>
<tr> <td colspan=1 rowspan=1 > Idaho </td><td colspan=1 rowspan=1 > Idaho giant salamander </td><td colspan=1 rowspan=1 > Dicamptodon aterrimus </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2015 </td></tr>
<tr> <td colspan=1 rowspan=1 > Illinois </td><td colspan=1 rowspan=1 > Eastern tiger salamander </td><td colspan=1 rowspan=1 > Ambystoma tigrinum </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2005 </td></tr>
<tr> <td colspan=1 rowspan=1 > Iowa </td><td colspan=1 rowspan=1 > American bullfrog </td><td colspan=1 rowspan=1 > Rana catesbeiana </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Unofficial </td></tr>
<tr> <td colspan=1 rowspan=1 > Kansas </td><td colspan=1 rowspan=1 > Barred tiger salamander </td><td colspan=1 rowspan=1 > Ambystoma mavortium </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2005 </td></tr>
<tr> <td colspan=1 rowspan=1 > Louisiana </td><td colspan=1 rowspan=1 > American green tree frog </td><td colspan=1 rowspan=1 > Hyla cinerea </td><td colspan=1 rowspan=1 > American green tree frog 1.JPG </td><td colspan=1 rowspan=1 > 1993 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Minnesota </td><td class="highlighted"  colspan=1 rowspan=1 > Northern leopard frog </td><td colspan=1 rowspan=1 > Rana pipiens </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Proposed in 1999 </td></tr>
<tr> <td colspan=1 rowspan=1 > Missouri </td><td colspan=1 rowspan=1 > American bullfrog </td><td colspan=1 rowspan=1 > Rana catesbeiana </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2005 </td></tr>
<tr> <td colspan=1 rowspan=1 > New Hampshire </td><td colspan=1 rowspan=1 > Red-spotted newt </td><td colspan=1 rowspan=1 > Notophthalmus viridescens </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 1985 </td></tr>
<tr> <td colspan=1 rowspan=1 > New Mexico </td><td colspan=1 rowspan=1 > New Mexico spadefoot toad </td><td colspan=1 rowspan=1 > Spea multiplicata </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2003 </td></tr>
<tr> <td colspan=1 rowspan=1 > New York </td><td colspan=1 rowspan=1 > Wood frog </td><td colspan=1 rowspan=1 > Lithobates sylvaticus </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Proposed in 2015 </td></tr>
<tr> <td colspan=1 rowspan=2 > North Carolina </td><td colspan=1 rowspan=1 > Pine barrens tree frog (state frog) </td><td colspan=1 rowspan=1 > Hyla andersonii </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2013 </td></tr>
<tr> <td colspan=1 rowspan=1 > Marbled salamander (state salamander) </td><td colspan=1 rowspan=1 > Ambystoma opacum </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2013 </td></tr>
<tr> <td colspan=1 rowspan=2 > Ohio </td><td colspan=1 rowspan=1 > Spotted salamander (state amphibian) </td><td colspan=1 rowspan=1 > Ambystoma maculatum </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2010 </td></tr>
<tr> <td colspan=1 rowspan=1 > American bullfrog (state frog) </td><td colspan=1 rowspan=1 > Rana catesbeiana </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2010 </td></tr>
<tr> <td colspan=1 rowspan=1 > Oklahoma </td><td colspan=1 rowspan=1 > American bullfrog </td><td colspan=1 rowspan=1 > Rana catesbeiana </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 1997 </td></tr>
<tr> <td colspan=1 rowspan=1 > Pennsylvania </td><td colspan=1 rowspan=1 > Eastern Hellbender </td><td colspan=1 rowspan=1 > Cryptobranchus alleganiensis </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2019 </td></tr>
<tr> <td colspan=1 rowspan=1 > South Carolina </td><td colspan=1 rowspan=1 > Spotted salamander </td><td colspan=1 rowspan=1 > Ambystoma maculatum </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 1999 </td></tr>
<tr> <td colspan=1 rowspan=1 > Tennessee </td><td colspan=1 rowspan=1 > Tennessee cave salamander </td><td colspan=1 rowspan=1 > Gyrinophilus palleucus </td><td colspan=1 rowspan=1 > Gyrinophilus palleucus Tennessee Cave Salamander.JPG </td><td colspan=1 rowspan=1 > 1995 </td></tr>
<tr> <td colspan=1 rowspan=1 > Texas </td><td colspan=1 rowspan=1 > Texas toad </td><td colspan=1 rowspan=1 > Bufo speciosus </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2009 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Vermont </td><td class="highlighted"  colspan=1 rowspan=1 > Northern leopard frog </td><td colspan=1 rowspan=1 > Rana pipiens </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 1998 </td></tr>
<tr> <td colspan=1 rowspan=1 > Washington </td><td colspan=1 rowspan=1 > Pacific tree frog </td><td colspan=1 rowspan=1 > Pseudacris regilla </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2007 </td></tr>
</table>
Question:
Which two states have the northern leopard frog as a state amphibian?
Answer:
Northern leopard frog is the state amphibian of Minnesota and Vermont.