You mean journal logs? First I am just a user in terms of knowledge. Do not know anything much about ppp. To contact folks like developers ask about this on OpenMandriva Cooker IRC. More on OM IRC here.
If I simply try to run /usr/sbin/pppd on Lx 4.2 (fully up to date) I get this in journal:
$ journalctl -b | grep ppp
Jul 23 11:51:38 vbox-64-3765 sudo[1635]: ben79 : HOST=vbox-64-3765 ; TTY=pts/1 ; PWD=/home/ben79 ; USER=root ; COMMAND=/usr/sbin/pppd
Jul 23 11:51:38 vbox-64-3765 pppd[1641]: pppd 2.4.9 started by ben79, uid 0
Jul 23 11:51:38 vbox-64-3765 pppd[1641]: Using interface ppp0
Jul 23 11:51:38 vbox-64-3765 pppd[1641]: Connect: ppp0 <--> /dev/pts/1
Jul 23 11:52:08 vbox-64-3765 pppd[1641]: LCP: timeout sending Config-Requests
Jul 23 11:52:08 vbox-64-3765 pppd[1641]: Connection terminated.
Jul 23 11:52:08 vbox-64-3765 pppd[1641]: Receive serial link is not 8-bit clean:
Jul 23 11:52:08 vbox-64-3765 pppd[1641]: Problem: all had bit 7 set to 0
Jul 23 11:52:08 vbox-64-3765 pppd[1641]: Modem hangup
Jul 23 11:52:08 vbox-64-3765 pppd[1641]: Exit.
These are the default packages in fully up to date Lx 4.2 system:
$ rpm -qa | grep ppp
ppp-2.4.9-2.x86_64
ppp-pppoatm-2.4.9-2.x86_64
ppp-radius-2.4.9-2.x86_64
rp-pppoe-3.14-1.x86_64
I see this in /usr/lib64/pppd:
$ ls -lh /usr/lib64/pppd
total 8.0K
drwxr-xr-x 2 root root 4.0K Feb 11 19:17 2.4.5
drwxr-xr-x 2 root root 4.0K Feb 11 19:16 2.4.9
To find what packages are available use dnf search ppp.
Hope some of this was helpful.