There are some great ideas and games on this website; https://www.readingrockets.org/strategies/rhyming_games
List of 50 rhyming books. Many of these are ones I'd recommend. https://theimaginationtree.com/the-best-rhyming-books-for-kids/
Rhyming basket - put handful of carefully chosen toys into a container, put them into rhyming pairs, e.g. bear and chair, cat and mat etc. https://theimaginationtree.com/rhyming-pairs-basket-literacy-game/ I thought this was a really lovely idea. There are lots of links on this to other articles etc that she's written linked to rhyming.
Online rhyming games https://www.topmarks.co.uk/Search.aspx?q=online%20rhyming%20games