Toddler tent beds can be difficult items to find. Most of the tent beds that I’ve seen are raised type beds which appear to be designed for slightly older kids. However, there are some in a toddler bed size, such as this one, which is a toddler bed with tent:
An alternative to toddler tent beds is a bed tent such as that shown in the example below, and as described in more detail on some of the other pages on this site. Though it’s important to keep in mind that most bed tents for kids are in a twin size, which is substantially bigger than a toddler mattress size.