Not to my knowledge no mods are available since the game supports MP.
Besides the game saves auto every 3 minutes that's pretty quick, logging out to menu saves the game.
Or open the console with F5. Now, type 'save' and press enter. This will save your game. Note that if you are playing Valheim on a multiplayer server, only the admin can force save using console commands.
Actually I just remembered in order to enable consol cmds you will need to open the properties of Valheim in the launch options type > -console ok it launch game press F5