The size chart is men’s and the department reads men’s but the description says boys... which sizing is this for boys or men?

The size chart is wrong. Go to fruit.com (manufacturers website). Select boys, any item, and you'll see the CORRECT size chart.

Will x large fit a 5year old boy

XL would be too big for a 5 Y/O, this fits an 11-15 Y/O

I ordered the monster style 10 pack in 4t/5t and received 2t/3t twice (replacement) does it only come in 2/3t in that design even though it says 4t?

****** Update****** Called back to Amazon. On the desktop amazon if you select 2-3T it will change it to 4-5T in your cart. Per the Amazon rep she stated I have the 4-5 in my cart and I placed the order. When I checked it on the mobile app it had 2-3T. She did see what I was talking about. I advised to have them look into this issue.