There are 2 repositories under telegram-to-discord-bot topic.
Telegram to Discord Message Bot — Forward Telegram Messages to Discord is a free and open source, telegram to discord message bot. It enables one to forward messages from Multiple Telegram channels to one (or more) Telegram/Discord channels of your own. This python bot monitors multiple telegram channels. When a new message/entity is sent, it will parse the response and forward it to a discord channel using your own personalized bot. It will also forward the same message to your own Telegram channel.
Mirror all messages from Telegram channels to Discord via a webhook also translate any message that is not in English.
A bridge to forward messages from those pesky Telegram channels to a shiny Discord server, because why not?