The poet uses language in the stanza to present Timothy as a silly boy. Timothy Winters is portrayed as an unusual, perhaps even ridiculous, figure.

The first line of the stanza describes Timothy's appearance as he arrives at school. The use of simile in this line emphasizes the contrast between the size of his eyes and the size of a football pool. The comparison to a large swimming pool gives the impression that Timothy's eyes are overly large and cartoonish, which contributes to the overall sense of silliness.

The second line uses hyperbole to exaggerate Timothy's ears. The comparison to bombs implies that Timothy is loud or perhaps even explosively loud. The comparison is also absurd when considered literally, as ears are not typically associated with loudness. Again, this contributes to the sense that Timothy is an unusual and silly figure.

The third line of the stanza describes Timothy's teeth as being like splinters, which is both painful and suggests that he might be unkempt or unhygienic. The comparison to splinters also implies that Timothy's teeth are sharp or pointy, adding to the sense that he is not a typical or desirable figure.

Finally, the last line of the stanza compares Timothy to a blitz, which is a fast and powerful military attack. Again, the simile is hyperbolic, as a child is not typically associated with such a violent and powerful image. The overall effect of these language choices is to present Timothy as a figure of fun and silliness, someone who is perhaps lovable but also a little absurd.

In conclusion, the poet uses language in this stanza to present Timothy Winters as a silly boy. The hyperbolic comparisons and similes used throughout the stanza emphasize the unusual and exaggerated nature of Timothy's appearance and behavior. Despite this, the overall effect is a sense of fondness for Timothy, who is presented as a lovable but slightly ridiculous figure.