Set sshd to serve different shell based on `host`
I'm not able to find a way to accomplish what you're asking for directly with sshd and the options available in man sshd_config or man sshd.

Method #1 via ssh client

The first method that comes to mind is pretty straightforward. You can either do it directly with just ssh.

$ ssh -t user@someserver bash


-or-

$ ssh -t user@someserver dash


Examples

bash

$ ssh -t manny.bub.lan -l manny bash
$ ps | grep $$
31691 pts/0    00:00:00 bash


dash

$ ssh -t manny.bub.lan -l manny dash
$ ps | grep $$
31730 pts/0    00:00:00 dash


csh

$ ssh -t manny.bub.lan -l manny csh
manny:~% ps | grep $$
 1687 pts/0    00:00:00 csh


fish

$ ssh -t manny.bub.lan -l manny fish
Welcome to fish, the friendly interactive shell
manny@manny ~&gt; ps | grep $$_
fish: $$ is not the pid. In fish, please use %self.
ps | grep $$
           ^
manny@manny ~&gt; ps | grep %self
 4218 pts/0    00:00:00 fish


Method #2 via alias

You could leverage the above method in #1, and build aliases like these:

$ alias sshmanny1="ssh -t manny@manny-rei210-2.bub.lan bash"
$ alias sshmanny1="ssh -t manny@manny-rei210-2.bub.lan fish"


Then use them like so:

$ sshmanny1
manny@manny:~$ exit
exit
Shared connection to manny.bub.lan closed.


$ sshmanny2
Welcome to fish, the friendly interactive shell
manny@manny ~&gt; exit
Shared connection to manny.bub.lan closed.


Method #3 ~/.ssh/config

The third method I was able to find would build configurations that can do this on the client side of your SSH connection, instead of on the server via SSHD.

$ cat ~/.ssh/config
Host manny1
    HostName manny.bub.lan
    RemoteCommand bash
    RequestTTY force
    User manny

Host manny2
    HostName manny.bub.lan
    RemoteCommand fish
    RequestTTY force
    User manny 


Now when you want to connect you'd do so like this:

$ ssh manny1
manny@manny:~$ exit
exit
Shared connection to manny.bub.lan closed.

$ ssh manny2
Welcome to fish, the friendly interactive shell
manny@manny ~&gt; exit
Shared connection to manny.bub.lan closed.


References


Choosing the shell that SSH uses?