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Can 2.40 tires fit a 20 inch rim/wheel. I want move up from 2.35 tires but I'm not sure if I have to buy bigger rims/wheels or if I can ride it with the 20 inch wheels.

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Your question can't be answered as written.

The rim diameter (20") is not directly correlated with the tyre width.

Since your frame can fit a 2.35" wide tyre, there's a very good chance a 2.4" tyre will fit. However it is an increase of 2.1% so if you're running close now you may be out of luck.

The only time the rim dictates tyre width is the inner width of the valley of the rim.

https://gzmyu4ma9b-flywheel.netdna-ssl.com/wp-content/uploads/2016/08/mavic-ETRTO-ISO-rim-width-and-tire-standards-chart.gif

So your 2.35" tyre is 59mm moving to 2.4" which is 61mm. Chart suggests your rim will be fine.

TL;DR your frame is the limiting factor, not the rim.

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