Try searching for it to find the package name, using synaptic or APT.
returns a couple results that but probably not what you're looking for....
checking packages.debian.org doesnt seem like it exists in sid or anything.
You could grab package from kali repository and try installing on regular debian:
https://pkg.kali.org/pkg/ollydbg
Code:
mkdir /tmp/whatever;cd /tmp/whatever
wget http://http.kali.org/pool/main/o/ollydbg/ollydbg_1.10-1kali4_all.deb
wget http://http.kali.org/pool/main/k/kali-defaults/kali-defaults_2021.4.5_all.deb
sudo apt install ./*