<ul t-foreach="request.env['forum.post'].search([])" t-as='p'>
    <li><span t-field='p.name'/> </li>
</ul>

The forum is probably a bad example since 'a post' is not in a separated template...

But, just to give you an idea...

<ul t-foreach="request.env['forum.post'].search([('forum_id', '=', 1)])" t-as='p'>
    <t t-call='website_forum.post_description_full'>
        <t t-set='question' t-value='p'/>
        <t t-set='user' t-value='request.env.user'/>
        <t t-set='forum' t-value="request.env['forum.forum'].browse(1)"/>
        <t t-set='reversed' t-value="lambda x: x"/>
        <t t-set='searches' t-value="{}"/>
        <t t-set='header' t-value="{}"/>
    </t> 
</ul>

<t t-set='posts' t-value="request.env['forum.post'].search([('parent_id', '=' , False), ('forum_id', '=', 1)], order='create_date desc', limit=10)"/>
<h1> <t t-esc='len(posts)'/> lastest posts</h1>
<ul t-foreach="posts" t-as='p'>
    <li><span t-field='p.name' /></li>
</ul>

KR